Wire in CM can't be got rid of in any way by either side, once placed it stays put for the whole game..
Wire is excellent for taking the wind out of an attacking forces sails, it's
impassable to trucks, halftracks and armoured cars, and slows tanks to a crawl, so QB players should agree purchase limits because of its power.
Wiire can't be placed ON a bridge, but a single wire on the bank at the end of a bridge can cause a tank column to concertina and
jam up as the lead tanks encounter it and begin slowly scrunching their way over it, and if infantry are aboard and the column comes under fire, they'll hop off and probably get caught in the wire like flies in a web, ha-ha..
Wires slowing effect is most noticeable on roads, a number of wires place in ladder or zigzag pattern down a section of road or open ground will make enemy tanks waste a lot of time crawling through it, think "molasses"..
Incidentally, piling more than one wire in a stack on top of each other has
no extra slowing effect on tanks, one is enough.
PS -In all my tests,wire never bogged a single tank, so the risk is almost non-existent in dry weather at least.