Other cards may be used to affect the outcome of combat rolls. These include able generals such as Kemal, Otto von Below, or Putnik, or new weapons such as poison gas, mine attacks, flamethrowers or tanks (the latter only available after the Allied player has first played the "Landships" card, which has no effect but represents the first ineffective use of tanks in 1916). Each side has an "air superiority" combat card, which may appear at various times during the game, reflecting fluctuations in air superiority. Whereas many combat cards are one-off events, removed from play after a single use, several Allied combat cards (tanks, mines, hurricane bombardments) may be repeatedly drawn from the deck, and allow the Allies to gain a slight tactical edge in the latter part of 1918 as they are drawn more frequently from the small number of cards remaining in the game.