The variety of land and sea units was increased by introducing artillery and destroyers from A&A: Europe and A&A: Pacific to A&A: Revised edition. Artillery increased the effectiveness of infantry in attacks, while destroyers limited the usefulness of submarines and acted as a lower-cost substitute for the expensive battleship. Cruisers were introduced in A&A: 50th Anniversary Edition to effectively split the destroyer's many abilities. While destroyers continue to limit the usefulness of submarines, the stronger cruisers now act as lower cost battleships.
The variety of land and sea units was increased by introducing artillery and destroyers from A&A: Europe and A&A: Pacific to A&A: Revised edition Artillery increased the effectiveness of infantry in attacks, while destroyers limited the usefulness of submarines and acted as a lower-cost substitute for the expensive battleship. Cruisers were introduced in A&A 50th Anniversary Edition to effectively split the destroyer's many abilities. While destroyers continue to limit the usefulness of submarines, the stronger cruisers now act as lower cost battleships.