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It started during a raid of the imperial troops to a small rebel base in the moon Laavardack. The fighting was fast and furious and Rodian rebel pilot Leenda, flying her Y-Wing, got engaged in a dogfight with ace TIE Fighter pilot Arax Torque. Their fight got them away from the main battlefield, through the canyons and exotic rock formations of the moon. During the intense dogfight, the ships got too close to each other and a wing from the TIE fighter made a glancing contact with the Y-Wing. The impact sent both ships crashing through the forest. Arax got off what remained of his fighter and made his way to the Y-Wing, to finish the rebel pilot off. But when he got there and saw the unconscious Rodian girl he couldn't bring himself to kill her.
By that time the rebels had fled the moon, with the imperial troops in hot pursuit. Hours later, when Leenda woke up, Arax offered a truce. They would help each other until they could leave Laavardack, which was about to enter its winter phase, and there was no surviving that.
Arax and Leenda set to build a ship that could take them both out of the moon and to the nearest port, out of the remains of both their ships. Oddly, the TIE cockpit was in better shape that the Y-Wing, so they took that as a base and set to increase its passenger and supplies capacity. They took the engines, the hyperdrive and the shield generator from the Y-Wing, and refitted what could be salvaged of the wings of the TIE fighter. They also took parts from some other fallen ships from the battlefield, but those were too damaged to be much good.
During this time, the pirates that betrayed the rebel base location came to the moon, carrion seekers looking for anything valuable after a battle. The design of the ship had to be altered to include more weaponry, to be able to sustain more damage in a frontal assault for breaking the pirate's blockade, and to be able to escape in a desperate situation. The shield from the Y-Wing was concentrated on the TIE wings, now used as a frontal shield; and considerations were taken so the ship could loose its wings and/or its main engines, and still be able to fly.
Arax and Leenda named the ship the Truce.
During the months it took to build the Truce, mutual respect surged between Arax and Leenda at first, followed by friendship and then by love (yes, love). When they finally escaped from Laavardack, they decided to stay away from the war and became guards for freighters and transports, the Truce having turned out better than they could have imagined.