From CNN:
The best -- and worst -- movie battle scenes - CNN.com
The best ...
1. Apocalypse Now -- Helicopter attack
Francis Ford Coppola, 1979
2. Saving Private Ryan -- Omaha Beach landing
Steven Spielberg, 1998
3= Lord of the Rings: The Two Towers -- Helm's Deep
Peter Jackson, 2002
3= Lord of the Rings: Return of the King -- Pelennor Fields
(until the Army of the Dead arrive)
Peter Jackson, 2003
5. A Bridge Too Far -- Parachute drop
Richard Attenborough, 1977
6. Tora! Tora! Tora! -- Attack on Pearl Harbor
Richard Fleischer, Kinji Fukasaku, Toshio Masuda, 1970
7. Zulu -- Battle of Rourke's Drift
Cy Endfield, 1964
8. Starship Troopers -- Battle of Klendathu, Battle on Planet P
Paul Verhoeven, 1997
9. Braveheart -- Battle of Stirling
Mel Gibson, 1995
10. Gladiator -- Battle in Germania
Ridley Scott, 2000