"17, 18, 19, 20, 21, 22, 23 …" Gimli stood between two ladders knocking the Uruks off similar in a way of whack-a-mole.
More Uruks gathered in shield formation and began going up the causeway. "Causeway! Hurl to flow! Hurl!" Aragorn shouted to elves with bows in their language and they released arrows on the Uruks on causeways causing some of them to fall off.
"Uruk-hai are advancing up the causeway! Concentrate your fire at them now!" Jim shouted. The marines (normal and infested) and reapers turned their attention to the Uruks on causeway shooting them on the sides so that more would fall off. No matter how many Uruks on the causeway were shot down, they kept on advancing with more replacing the fallen.
"Is this it? Is this is all you can conjure, Saruman?" Theoden muttered.
"Jim, below you!" Kerrigan got his attention as a pair of Uruks bringing in a huge spiked ball into the grate and another pair brought in another.
"Damn it! They brought explosives!" Jim guessed as he saw a berserker with a torch running towards the grate.
"Explosives? That's impossible!" said Swann.
"Bring him down, Legolas!" Aragorn shouted in elvish to Legolas. The prince of Mirkwood fired an arrow on the berserker's right shoulder. "Kill him! Kill him!" the Dunedain yelled in elvish and Legolas released another arrow on the berserker's right shoulder.
Jim opened fire at the berserker filling it with as many rounds as he could. Despite of the huge amount of damage, the berserker lunged towards the explosives. "F…" said Jim but was cut when the explosives went off shocking everybody. Debris and bodies were thrown up by the explosion. Aragorn was sent flying into the ground and knocked unconscious. Kerrigan was knocked unconscious and landed on top of Jim when the man she loved was in supine position.
"It's an explosion," said Stetmann as he, the medics, the women, and children heard the noise in the caves.
"How did the enemy make explosives?" a medic asked knowing that marauders, siege tanks, banshees, and thors were not used.
"I wonder how," Stetmann had no answer to that.
"Raynor! Kerrigan! Can you hear me?!" Artanis shouted.
"My Queen!" Zagara called out.
"We should prepare," said Alarak as he activated his bane blades while the Uruks began storming through the gap.
Theoden saw the Uruks on causeway brought in a battering ram, "Brace the gate!" The men of Rohan below pushed the gate while the others above hurled rocks and spears at the crew. "Hold them! Stand firm!" the king shouted.
Aragorn and Gimli began regaining conscious when the Uruks entered through the gap. "For Aragorn!" the dwarf shouted and jumped at the Uruks from the battlements.
"Gimli!" the Dunedain shouted as the dwarf took a few Uruks down before being knocked off balance. "Hurl the arrows!" Aragorn shouted in elvish causing the elves on ground released a volley of arrows. "Charge!" the Dunedain shouted in elvish causing the elves to draw swords and charge. Aragorn shoved a pike apart and decapitated an Uruk.
Everybody regained conscious and the fight in the battlements resumed. But Jim noticed the gap and shouted, "Raiders, suppress the flow!" The firebats began heading towards the Uruks and the vulture bikes began firing at the Uruks. The firebats and hellions caught many Uruks on fire causing them to run around before collapsing into the ground motionlessly.
"Zagara, Dehaka, hold off the Uruk-hai on ground," Kerrigan called out.
"As you say," said the brood mother. "Minions, kill the Uruk-hai," she ordered. The zerglings all charged at the Uruks clawing them mercilessly and attempted to overwhelm them. The infested colonists joined in and began clawing the Uruks. At a distance, the roaches engulfed many Uruks with acid corroding them. Roachlings were spawned by Kerrigan's roaches and helped out clawing the Uruks. Zagara impaled two Uruks at a time with her talons while Dehaka slashed the Uruks.
"Warriors, it's time!" Artanis readied his twilight blades. He, the Aiur zealots, and the Nerazim centurions began charging at the Uruks. Artanis' lightning dash killed multiple Uruks before he began slicing the Uruks. A centurion could kill two Uruks at a time with two psionic blades whereas an Aiur zealot could use whirlwind to slice multiple Uruks into pieces. The dragoons fired their phase disruptors disintegrating the Uruks within impact and the stalkers picked off the Uruks with their particle disruptors. The Aiur avengers joined in slicing the Uruks into pieces unnoticed while the Nerazim dark Templars used shadow strike slicing clusters of Uruks into pieces. The Aiur sentry robots picked off some of the Uruks with their disruption beam and restored shields to allies.
"Time to purify these foul creatures," Talandar ordered. He and the sentinels charged at the Uruks. Talandar slashed the Uruks with his purifier blades and used whirlwind killing multiples of them. Like a centurion, a sentinel could slice two Uruks at a time with its blades. The robotics energizers boosted the speed of movement and attacks of their allies.
"Tal'darim, show them what we are capable of," Alarak ordered and casted destruction wave killing a horde of Uruks before charging at them then slicing them with his bane blades. The blood hunters joined in unnoticed and sliced the Uruks into pieces. The robotic havocs extended the attack ranges of their allies.
Legolas took an Uruk's shield and slid it ahead. He jumped on and skated downwards while shooting the Uruks on the way. The elf had the shield flew right at an Uruk's chest and stabbed an Uruk with an arrow.
Aragorn helped Gimli back into his feet and the two rejoined the fight.