A/N: I don't own Fallout 4 or any of the characters in the game.
Elder Arthur Maxson's Vertibird followed behind Liberty Prime, as the giant robot made its way across the Commonwealth towards its goal of the Institute. Brotherhood soldiers followed close behind and in front of the robot. Maxson had mobilized the majority of his forces in the Commonwealth for this attack, even now as his forces crossed the Commonwealth, the forces at Cambridge police station under Paladin Dillon were securing the courtyard of the CIT ruins. Maxson just hoped the Pershing and his force's infiltration of the Institute was on schedule if it wasn't, then the entire operation might be a failure.
"Synth forces relaying in to the front and to the west!" The Lancer yelled from the cockpit. Maxson shifted his attention to those areas and saw the blue hue that he had become are to familiar with in the previous few days.
"Bring us around!" Maxson roared, and the Vertibird moved so that the machine gun was pointed to the Synth abominations, Maxson opened fire. Three fell in the first few seconds of the barrage, but the Institute just kept on relaying more and more in. The synths kept falling. Maxson was starting to feel good about the attack, just as he heard
"SYNTHS RELAYING BEHIND US!" A Knight said as he began to open fire with his laser rife. a few moments later he yelled "ROCKETS!"
The first rocket missed the Vertibird, but the second did not. Knowing that the Vertibird was going to go down, Maxson sprung into action, yelling for the powered armored soldiers to grab their less armored brethren. He reached out and grabbed the light knight to his left, and braced himself for the crash.
Pershing, Danse, and Preston Garvey continued to walk through the sewers. They had been in the sewer that had the secret entrance to the Institute for nearly an hour and a half, and had come across only a squad of Synths, and a few of the laser turrets. Which probably meant that they were in the right place.
"I wonder if the Brotherhood has launched their assault?" Garvey wondered out loud; Pershing spared a moment to look back his second in command. Garvey was obviously tired, with heavy bags underneath is eyes.
"They probably launched the assault as soon as we got into the sewer system" Danse answered from behind Garvey. "At least that's what would have been the most sensible thing to do."
Garvey scoffed and said "Because the Brotherhood always does the most sensible thing." Pershing sighed, knowing that both of his top officers had strong feelings about the Brotherhood, they would argue back and forth about them for the rest of the mission if he allowed it.
"Cut the chatter about the Brotherhood" turning to Garvey he said "Like it or not, the Brotherhood is now our ally in this fight. "He turned to Danse and said "We can't have this sort of infighting right now." Both men looked down and didn't say anything. "We have to keep our eye on the ball and defeat the Institute, after that we can decide what sort of relationship we need to establish with the Brotherhood." Of course, if he had it his way, the Minutemen and the Brotherhood would coexist and work together to bring peace and stability to the Commonwealth, but whether or not Maxson wanted that, or his own ranks in the Minutemen wanted that was another problem.
The sewers led to a dead end with both turns leading to the dead ends. "Spread out and try to find a way through the walls." The wall had some small holes in it, and he could see that there were rooms on the other side of the wall. "If we don't find a way, we will just blow our way through it.
They did find a small hole in the wall that they could barely fit through, and they found themselves in what looked like an abandoned workshop. "Might've been an old maintenance tunnel" Pershing decided, he looked around and spotted another door. "Looks like our way through." He motioned with his Assault Rifle and the three of them moved through it.
"Motion detected" a synthetic voice rang through the room, just before blue laser beams started to fly towards the Minutemen. Pershing barely dodged one of them as he dove for cover behind and old generator.
He turned the corner and sent a stream of bullets towards the direction of the synths. They had to take these bastards down before they were able to get word back to the Institute. He looked over at Garvey, who had taken dropped to the floor and was returning fire in a prone position. "Garvey throw a grenade!" Pershing yelled. Garvey stopped firing and reached for his grenades as Pershing tried to suppress the synths. He saw the grenade fly towards the enemy and land right and the feet of the three synths. The explosion destroyed them moments later.
Slowly, Pershing got out of cover and checked for more synths. Not seeing any he yelled "Okay, looks like were clear." He spotted a man-sized pipe and checked the schematics on his PIP- Boy that Sturges had found. "Looks like this is it." He and the others walked over to it opened the sliding door. Looking to the right just led to a dead end, so they moved to the left and followed the pipe, hoping that it would not take long to get to the Institute.
As they moved through the pipe, a was rumbling that seemed to come from above. The sewage water they sat in splashed as it reacted to it, and dust fell from the ceiling, looking up Garvey stated "Sounds like the Brotherhood is getting closer, had to of been a mini-nuke to cause that sort of thing"
"Or one of Liberty Primes nukes" Danse stated "When we -"he stopped abruptly, and then started back "When the Brotherhood used Liberty Prime back in the Capital Wasteland, if you were close to the battle, you had trouble staying on your feet."
"Wish we had that thing back in Alaska" Pershing muttered under his breath. "Would've saved a lot of lives. Of course, it probably wouldn't have mattered much anyway." He finished his thought bitterly. Behind him both Danse and Garvey looked at each other. It wasn't often that Pershing talked about his life before the wasteland. He looked behind himself and said "Let's keep going c'mon."
Arthur Maxson coughed and looked around his surroundings, the Vertibird had gone down hard, and many of the lighter armored soldiers were badly hurt or dead. The Knights and Paladins that had been following behind Liberty Prime had fallen back and formed a perimeter around the fallen Vertibird. And were currently fighting the synths around the Vertibird and keeping the synths from attacking the survivors.
A field-scribe ran up to the Vertibird and pulled the Knight off of Maxson. "Elder," another scribe yelled. "Are you okay?"
"I'm fine, check on the others." Maxson yelled. The scribe nodded and went off to aid the wounded. Maxson pulled himself out of the destroyed Vertibird, and grabbed his Laser Rifle. He ran toward the front of the perimeter, where the fighting was the thickest. The Paladin in charge of the perimter looked at him. "What's the situation Paladin?" he asked.
"The Synths are pushing us across the perimeter!" The voice of Paladin Brandis answered him" He pointed to the direction of the CIT ruins. "The rest of the force, along with Liberty Prime, have continued on towards CIT!" As he was reporting this, his hand was hit with the blue laser of a Institute Laser Rifle. Maxson turned shot the perpetrating Synth.
"As soon as the casualties are loaded back onto the gunships, we need to move!" Maxson yelled over the fighting. The fighting was fierce defending the perimeter, and Maxson was suddenly wishing that the Brotherhood had been able to bring their own artillery to the Commonwealth, but that was unfeasible with deconstructed Liberty Prime having been brought as well. As the last of the Vertibirds took off and flew back off to the Prydwen.
"MOVE OUT!" Maxson roared and the Brotherhood soldiers began too. Maxson led the force as they finished the last leg of the journey to the CIT ruins. The area leading to CIT had seen heavy fighting and craters from Liberty Prime's nukes littered the way. To Maxson's relief, it appeared as though the Brotherhood had taken minimal casualties to the Institute. Just as CIT entered his view, he could see the fighting there was intense. "DOUBLE TIME IT!" He yelled as he broke out into a sprint, as did the rest of the soldiers following him.
As they reached CIT, Liberty Prime destroyed the left side of the building with one of his nukes. Scribe Ingram ran over to him and yelled. "Good to see you sir." She looked up to Prime and said "He needs time to locate where the Institute is under there!"
Elder Maxson nodded and yelled "DO WHAT EVER YOU HAVE TO TO PROCTECT PRIME SOLDIERS!" as he finished giving the order, more Institute synths relayed in. Maxson took aim at the first one and fired, killing it instantly, as did the soldiers around him. Maxson vaguely heard Prime say that he had found where the Institute was and saw him as the robot fired a drilling beam into the ground. "KEEP FIGHTING PRIME'S ALMOST DONE!" The synths were slowly destroyed, and the reinforcement stopped relaying in. 'They must be pulling back to prepare for our attack in the Institute itself.' He thought as he and his soldiers ran to the hole that Liberty Prime had just stopped drilling. "Let's go! For the Brotherhood!" Maxson yelled the war cry as he jumped into the hole.