Attack on Alastor Moody

"- and reading between the lines of that Skeeter woman’s article last month, Moody was attacked the night before he started at Hogwarts. Yes, I know she says it was another false alarm, but I don’t think so, somehow. I think someone tried to stop him from getting to Hogwarts. I think someone knew their job would be a lot more difficult with him around. And no one’s going to look into it too closely; Mad-Eye’s heard intruders a bit too often. But that doesn’t mean he can’t still spot the real thing. Moody was the best Auror the Ministry ever had."

- Sirius Black regarding the attack

This Conflict took place between Alastor Moody, and Bartemius Crouch Junior along with Peter Pettigrew in order for Bartemius Crouch Junior to impersonate Alastor Moody, in order to help Harry Potter throughout the Triwizard Tournament, in order for him to touch the Triwizard Cup, witch he would turn into a Portkey, witch would take him to the Little Hangleton graveyard in order for Peter Pettigrew to use his Blood to ressurect Lord Voldemort.

The attack
Before the school year began, Moody was attacked in his home by Barty Crouch Jr and Peter Pettigrew, at Voldemort's order. Moody proved more difficult to overcome than initially thought, and put up a significant fight which alerted his Muggle neighbours, but was overpowered and imprisoned in his own magical trunk. This was done as part of Voldemort's plan to regain power.