I agree with Alan, some engineers would be awesome since that was such a huge part of their job (both laying them and removing them). We have an ESCI DAK carrying a mine, we have an Airfix 8th Army with a mine detector, an Airfix DAK with a shovel, we have a couple Wat 1815 Italians, one Folgore crawling with a mine and one Italian with a shovel. So, not the same army. A set with mine layers/removers, prodding the ground with bayonets, mine sweepers, guys with picks and shovels, maybe a pneumatic drill, all possibillities.