ra3damagetype Red Alert 3 has 9 damage types in total: cannon, autocannon, gun, rocket, anti-air, explosion, magnetic storm, prism, and concussion damage. Each unit has different resistances to the various damage types. See the guide in this article for details:

RA3 damage types explained: 1. Cannon damagetype_1

  1. Autocannon damagetype_2

  2. Gun damagetype_3

  3. Rocket damagetype_4   5. Anti-air damagetype_5

  4. Explosion damagetype_6   7. Magnetic storm damagetype_7

  5. Prism damagetype_8   9. Concussion damagetype_9

  6. Special cases damagetype_10