Leaders are not eliminated, instead follow procedure in 22.34. Leaders stack for free. Basically, use the highest level in the hex. In each combat, the defender executes any standfast attempt and retreats before the attacker. One artillery supply point replenishes one salvo.
Artillery is landed at the same time as reinforcements.
Note this effectively means that the Allied player cannot use landed artillery ammo until the turn after landing. Thus, the German Player can make use of new ammo the same turn it is received. Players cannot allocate more points to a mission than the maximum number shown on its allocation track. Note that on-map Allied air points are required to reach certain levels. Some units can be assigned or unassigned at the player's option.