No they didn't, Multiple Parshendi beat on Sadeas for several minuets, and he still hadn't broken his plate,
at the battle of the tower Dalinar got hit by stones the size of human heads, and all it did was puff stormlight, it didn't even crack.
Dalinar fell hundreds of feet through TWO entire houses, before coming to a stop and still beat a Shardbearer.
Dalinar held the weight af a creature almost 72 stories high, and that only cracked it.
No way are mistborn getting though that.