Mothra had something terrible come to mind. She learned Infant Island was under attack. She flew home as fast as possible in what was slowly turning into an unstoppable rage. Nobody threatens her home or her people. The Vortaak just attacked both.
General Ardal was increasingly desperate as all of his forces had fallen. He personally oversaw an invasion of Infant Island in an attempt to draw out and kill Mothra using the superior firepower of the mothership. Their emphasis on destroying Godzilla and the others may have been misplaced. Mothra had shown her true strength by annihilating Hedorah and the General knew the moth had to be dealt with immediately. Since the fleet was weakened severely and since the villagers were incredibly primitive with just spears for warfare, it was a ground invasion. The fighters awaited the arrival of Mothra.
The villagers did their best but the Vortaak forces and their plasma rifles easily overpowered them. Silver armored alien soldiers stormed the village and while some were brought down by the spear-wielding natives, the superior firepower of the Vortaak prevailed. The villagers and the priestesses all fled for a shelter on the cliffside to hide. It was not long though before Mothra arrived. She appeared and began shooting down Vortaak fighters with her energy beams, and caused the others to crash with her scales. The divine moth showed no mercy towards the Vortaak.
General Ardal sat in his command chair and ordered the crew to open fire with the mothership turrets. Streams of blue destructive energy were launched from under the ship at Mothra. She dodged most of the shots until one hit her and sent her spiraling down to the island below. Before she met the ground, she managed to correct herself and fly towards the ship once again. Using her energy beams she destroyed two of the eight cannons. General Ardal ordered them to keep firing to destroy the moth. He could not afford to fail. Despite their best efforts, Mothra systematically destroyed all of the turrets. The moth did loops and barrel rolls, dodging all attempts to bring her down successfully. As each turret exploded the General felt his anger grow more and more.
The General sent the remaining fighters to battle Mothra as the mothership began to pull back. Mothra was out for blood, as they dared to spill the blood of her people. She began taking on over ten alien ships on her own as her people watched amongst the rocks, filled with hope. The ships were destroyed one by one with ease, some dropped by energy blasts and others brutally flown into. By the time she had finished though, the mothership had successfully retreated. The Vortaak infantry was unfortunately left behind amongst the skirmish. They were not to be granted mercy.