How to Complete Wanted: Gaitsnipe
The objective is to defeat all foes. The foes are an Archer, a Cannoneer, a Flintlock, a Fusilier, a Hunter, and a Sniper. All of them use ranged weapons, but you are forbidden from using ranged weapons yourself. You can still use ranged magick attacks, however. The Sniper can inflict Doom, so you might want to equip someone with a White Staff, because if you hit a Doomed unit with the White Staff, the Doom status will be removed.