Trench Warfare

During the Dacian civil war, several battles occurred involving trenches. During the 3rd Kalmacian-Dacian War, the DNS 1st Corps (The Bangle Guard) famously fought an eight week long battle at the narrowest part of the Kalmacian coast--a mere 2 kilometer long strip of land divided into three terraces--against Kalmacian troops. Both groups were dug in to trenches that angled away from each other as they extended down the terraces, to avoid enemy fire from above. The two armies found that their spears were mostly useless, and ended up ordering, constructing, or simply buying more firearms to try and outshoot the enemy.
The intention of the battle was to cover the Dacian pillage of Eastern Kalmacia and to buy Racoco's army time to secure its holdings, but eventually local resistance proved too great and the action became a rear-guard operation to cover their retreat.
Very few men were actually killed in the battle, most of the casualties were a result of disease and infection. The Zells suffered far fewer losses because they were simply immune to most of the common illnesses, but eventually they were forced to retreat, one trench at a time, all the way back to Dace, where they finally retreated across the Sarvuna River into friendly territory.
This story of controlled, disciplined retreat, while associated with a humiliating failure of Dace's military overall, is a mark of significant pride for the Bangle Guard, and was used as proof of the effectiveness of the Zellish auxiliaries. Two more corps were raised afterwards under some of the surviving officers from the battlegroup, and the 3rd Corps' emblem was changed to a wheel with shovels for spokes.