The Corps of Engineers is sadly lacking in the equipment department. Calsahara doesn't have much of a budget for defense, but our soldiers make due with what they get.
Sandbags
Useful for defending against seasonal flooding, sandbags are the shield of Calsahara's southern border when the rain starts to pour. Filling them, however, is not very much fun.
Shovels
The mainstay of any good construction project, shovels are the Corps primary tool. Shovels are very versatile, and can be used to dig holes, fill sandbags, and squash spiders.
Note the Royal Foot manning a shovel at a ground-breaking ceremony for Montague Square.