Braces are the lines that control the angle of the yards. On the first rate men-o-war, the mainbrace was the largest and heaviest of all the running rigging; the mainbrace on HMS Victory is in diameter. Gunners commonly aimed for the ship's rigging during naval battles, with the mainbrace being the prime target. If the mainbrace was shot away, it was usually necessary to repair it during the engagement; the ship was unmanoeuvrable without it and would have to stay on the same tack. Even repairing it after the battle was a difficult job; the mainbrace ran through blocks, so it could not be repaired with a short splice or a knot. Splicing in a large run of hemp was strenuous work, and generally the ship's best Able Seamen were chosen to carry out the task under the supervision of the Bosun (