Dawnish War Song
This song works well if the singers do one verse in unison, perhaps with tabor or drum, then musicians on instruments like shawms, fifes and war-drums join to repeat the tune.
The tune is the first theme of Dead Can Dance's saltarello, but you could play instrumentals with any of their variations or make up some of your own.
A pdf of the lyrics and sheet music can be found here.
Sword and shield and armour bright Yeoman and witch and knight Now we march and now we fight Now have no fear, fight with me for glory here
Trumpet call and battle cry Raise the standard up on high Victory or else we die Now have no fear, fight with me for glory here
Take your weapons in your hand Shield to shoulder now we stand Never yield a foot of land Now have no fear, fight with me for glory here