i remember playing in one of the next to last Martial olympiads, and facing an IS playing guy who used thunder munitions. they hadn't been banned at that point, though only IS players had them (sometihng that i, as a clan player, really hated).
we wound up facing off in a capture the flag battle on two urban mapsheets (the 'harbor' ones from one of the mapsets).
the way the maps were set up, there were two choke points for reaching the other side. since the other guys had a clearer LOS to those choke points, he has his archer throw down a pair of 20pt thunder fields in each choke point, preventing me from getting across. i had nothing that could clear the fields, and my mechs (a guass mad dog and a fire moth) didn't have the armor to just walk across.
that action denied me the tactical mobility my force needed. we wound up with a tie, because he wasn't able to cross either (not because of the mines, but because ever time he showed his forces into LOS, they got hammered by my guass mad dog or my Oro tank..), though had my firemoth not been blown up, i might have won because my elementals found his flag, but were too slow to get it back across the battlefield for the victory.