(I've actually used him with a shrek to beat a sherman...1v1 with ftfl and with a med pack it's really funny)
unless a sherman user is complete idiot,this cant happen
use med pack? just crush him with sherman...
OR
stay at longe range with sherman and pummel him,his shreck will have crap accuracy or will e out of range
OR
just push him around so he cant aim and fire shreck