Across
- 4. Military accommodation for backstabbing (7)
- 8. Signals about golf? (5)
- 9. Increased pace, multiplied by two (6,4)
- 10. Strategies with magic in reverse (7)
- 12. Primate's key turns chaotic (6)
- 14. Secure grip on a speedy mount (8)
- 18. Napoleon I, icon of police drama (10)
- 19. Rodent partner's currency (6,3)
- 20. Knives to betray enemy (8)
Down
- 1. Battles between married couples? (11)
- 2. Weapons make us stammer, unfortunately (7)
- 3. Aimed at the object of ridicule (6)
- 5. Illuminated soldiers on the edge (5,8)
- 6. Higher ranks for those in charge (8)
- 7. Amphibian jumps over small water barrier (4)
- 11. Horsemen taking up key role in warfare (7)
- 13. Walking with rhythm and purpose (7)
- 15. Battle site where water's not cool (8)
- 16. Skippers around on ships (8)
- 17. Simultaneous shots fired in sequence (6)