In Animal Farm by George Orwell, what was the Battle of Cowshed?

In Animal Farm by George Orwell, the Battle of the Cowshed occurs when Mr. Jones, the human owner of Manor Farm before the animals took over, shows up with a group of men to get his farm back. Jones enlists the help of fellow farmers, Pilkington and Frederick, who in many ways are just as bad or worse than Jones. They are greedy and self-centered and even look at ways they might get something out of the animal take-over of Jones' farm. 

Sadly for the men, however, the animals are ready for them, and Snowball in particular, turns out to be quite the strategist. He knew the men would eventually come, and he has planned out what the animals should do.  

First, the pigeons warn the animals that the men are coming. Snowball gets the animals ready to attack them. He has been studying up on Julius Caesar's battle strategies, and proves himself to be a good leader during the Battle of the Cowshed. The animals' victory is swift, and Mr. Jones ends up in a large dung heap.