Possible Clues:

• Insurgent fighter
• Like some low-budget films
• Irregular mostly struggling to capture land’s leader?
• A month back, foul up badly in it? That's irregular
• Irregular bandit
• Fighter could see criminal argue about stream
• Rule a girl breaks for freedom fighter
• Irregular mostly out to install Left?
• Fighter sick with fever cycling round both sides of river
• Irregular conclusively swapping sides, shiftily?