A cousin of Vance von Borries's East Front System, Invasion Sicily covers the Operation Husky, 1943. The major difference from the Barbarossa games is the addition of an "efficiency rating" to all units, which affects combat in a variety of ways to make it less predictable and less subject to factor-counting (similar to OCS's action ratings). The Allies are given a variety of invasion options, from the historical Husky through invasions in eastern and western Sicily and (most aggressively) Calabria - the toe if Italy itself. The timing and units assigned to the invasions is almost entirely flexible.