Like Lord Thomond's cocks, all on one side.
Lord Thomond's cock-feeder, an Irishman, being entrusted with some cocks which were matched for a considerable sum, the night before the battle shut them all together in one room, concluding that as they were all on the same side, they would not disagree : the consequence was, they were most of them either killed or lamed before the morning.

The 1811 Dictionary of the Vulgar Tongue.