What does Napoleon say about what Snowball was doing for Jones the whole time?

He claims that Snowball was collaborating with Mr. Jones from the very beginning and claims to have supporting evidence. Snowball was never in league with Mr. Jones.

"Comrades!" cried Squealer, making little nervous skips, "a most terrible thing has been discovered. Snowball has sold himself to Frederick of
Pinchfield Farm, who is even now plotting to attack us and take our farm away from us! Snowball is to act as his guide when the attack begins. But
there is worse than that. We had thought that Snowball's rebellion was caused simply by his vanity and ambition. But we were wrong, comrades. Do
you know what the real reason was? Snowball was in league with Jones from the very start! He was Jones's secret agent all the time. It has all been proved by documents which he left behind him and which we have only just discovered. To my mind this explains a great deal, comrades. Did we not see for ourselves how he attempted--fortunately without success--to get us defeated and destroyed at the Battle of the Cowshed?"