[kcdusk]

Maybe the GM wants to see the PCs thinking, and putting any sort of tactics into play rather than just sitting tight and slugging it out.

I dont know anything about infantry tactics. But as a GM i'd give the PCs a break if they were trying something (flanking force? Booby trap a position before pulling back ...) rather than hoping the concrete and sandbags were going to save them.

Is the GM any good? Or is he just smashing you? Or does the opposing force have a weakness he wants you to figure out and hit?

I can see what you mean chalk about the tactic you suggest. The only problem i have with this (and it applies to almost any tactic you want to use) is its often hard via PbP for the PCs to have much situational awareness and know whats available or what position they are in to put "larger scale" (dare i say "wargame"???? :-) tactics into practice.