The most memorable case was only witnessed by me in a muli-player game of RB. One of my partners & I had the German side and he had been trying to take a position in a multi-story building defended by a death star in an upper level and fortified locations on the lower levels for several turns but without success and at increasingly heavy casualties. Sometime late in the evening he had to get some sleep, so another took over his forces in the area and managed to take the position, capturing the Russian MGs and heavily reinforcing it. After a few hours of rest he returned and resumed command of his forces, he still saw the MGs on the upper levels and assued the position was still in Russian hands (still a little woozy perhaps). Because of lack of sleep or other factors the Russian player failed to notice he no longer controlled the position as well when my returning partner fired on it with an 81 MTR, garnered a CH and then Yahtzeed the RS DRs and rubbled the building or the location. As he began to apply the final results he yelled "OH NO!" as we all realized the mistake and began to laugh so loudly that we woke up the remaining sleeping guys (we were all probably punch drunk by then) and had to explain the situation. Now it's been over 20 years that that happened and we still give him a ration of crap to this day and have a good laugh at his expense. (Can't remember if we let the result stand or not).