We play with as a separate step not involving any units - it is just a die roll.
Strategic Bombing:
The K. u. K. Luftfahrtruppen, Deutsche Luftstreitkrafte, Group de Bombardment, Royal Naval Air Service, and Corpo Aeronautico Militare all participated in strategic bombing raids on the enemy during WW1.
Procedure:
1. At the beginning of each player’s turn, A-H, Germany, France, Britain, and Italy can roll 1 die to determine if they cause IPC loss to the enemy.
2. A roll of 1 is a hit (Germany to France or Britain, AH to Italy, Italy to AH, and France and Britain to Germany), a roll of 2 thru 5 is a miss, and a roll of 6 is a miss and causes damage by your strategic campaign to be reduced by 1 for the remainder of the war.
3. For a hit, roll another die for damage. A 1, 2, or 3, and that is the IPC loss, a 4, 5, or 6 is 0 IPC loss. The damage is assessed against the IPC count for the next turn. (If neutral Italy rule in use for turn 1, a hit by A-H will also cause Italy to enter the war.)
4. Damaged bombing capability (roll of 6 in step 2), can be repaired by spending 1 IPC per damage.
