Just today I had one, actually...

My death company was readicated by massed starcannon fire coming from a guardian squad with a weapon platform and the warwalkers. Over the cours eof two round they were ripped apart, and at the end one of the twelve remained, Veteran Sergeant Midael of tactical squad Tzedechiah (The chaplain was killed when he was the only model not covered by a passing rhino.) As the guardian squad was ripped apart by rockets from my dreadnoughts, Midael fired up his jump pack and sailed over the rhino into the midst of the war-walkers. In the first round, he succeeded in immobilizing one and destroying the weapon of another. Though the battle was already for the most part decided, Midael turned it into a solid victory by destroying both walkers in the next round.

As a sidenote, I also has a veteran tactical sergeant take down a wraithlord in two rounds and move on to kill the enemy farseer. This was a game of heroics.