When did the battle of the cowshed happen in Animal Farm?

The Battle of the Cowshed takes place not long after Mr. Jones has been driven from the farm. In a bold,\ revolutionary insurrection, the animals rose up and sent the farmer packing, but Mr. Jones wasn't about to take that lying down. As far as he's concerned, he's the one in charge of the farm, not the animals. So he stages a daring counter-revolution, getting together a bunch of men to help him take back the farm by force.
Unfortunately for Mr. Jones, the animals are absolutely determined to remain in charge. When he and the other man show up at the farm, the animals immediately launch into an all-out attack, staging an ambush that takes Mr. Jones and his hirelings completely by surprise. Mr. Jones probably thought that because the Animalist revolution had only recently taken place the animals wouldn't yet be strong enough or sufficiently well-organized to resist. How wrong he was! The animals send Mr. Jones packing a second time, this time for good.