At the Badab weekend at GW HQ, I fired an entire Slugga boyz mob at a Grey Knight Terminator squad, in preparation for charging it. 20 s4 shots achieved absolutely nothing.
In desperation, I fired 4 grots that happened to be in range, and scored two hits: one wounded, and the save was failed. Result!
I charged in, with the Waagh in my favour: there was much choppa and power fist action, but very little in the way of wounds on either side.
However, the Grey Knights had lost, and rolled 11 for their morale: some gadget gave them a re-roll, but it came up 12!
But they're fearless (or similar) says my opponent, so they fight on. Right, I say, but they're outnumbered more than 6 to 1, so they take a heap of extra wounds. OK, he says, but I get my full save, because the choppa doesn't count for this - and then rolls three 1's!
Six Terminators killed by one gretchin blaster and the sheer weight of Ork bodies...