1. Arrange
The wave is the group of enemies coming next. You see them before the fight. Put your soldiers where they hold the line.
Levyhold
You lead a small company of soldiers. Before each fight you choose which soldier stands on which square of a grid. Then you press March, and the two sides fight with no help from you.
2. March
The fight plays out by itself and takes under a minute. A won wave pays Coin, the money here.
3. Muster
To muster is to call up a new soldier for Coin and Recruits (the people who can be called up). Soldiers of the same Company on the field give each other bonuses.
4. Keep going
Hold the Line repeats a wave you have already beaten, and your company keeps patrolling while you are away. Later you can take the Oath: start the Road again for permanent bonuses.
The game saves on its own. A check-in takes a few minutes; a long session is an hour or two. Every day there is also a Daily Muster puzzle, the same for everyone, with a board for the best scores.