Strategic Map of America (168k)
7 loaded galleons with their ironclad escorts brought in a large supply of fresh cavalry, infantry, and artillery at 1730 AD. As American forces continued to focus on Cumea, a sizable group of artillery was brought to bear on Atlanta, causing great damage to the rifleman defenders and allowing cavalry to charge in and destroy the city. However, casualties were high while taking Atlanta, and replacing losses would not be easy now that America had modern ships.
Out of nowhere, a grough of advanced American warships decended on Caesar's galleon fleet,
vaporizing a few defending ironclads. With heavy artillery support, ironclads might have been able to fend off a few destroyers, but Lincoln's Battleships would require a new strategy. Roman forces would focus on razing coastal cities to deny Lincoln the facilities to construct or repair his doomsday ships. To conserve irreplacable cavalry, artillery would have to be employed at each city, and the cavalry Armies could be brought in to deal with tough defenders. Many Battleships were sunk in port, and the Naval threat subsided as Southwestern American port cities were destroyed. When America began to use bombers against Cumea out of Northwestern cities, the artillery group had to be diverted to deal with the threat.
Briefly, the waves of bombers put Cumea in danger once again as the destroyed the barracks and damaged the Armies, but the artillery group attacked the Northern cities, destroying the American airforce on the ground. Now the offensive moved on to core American cities where the defenders were well entrenched. Artillery crews reported hitting factories and coal plants in nearly every city (even the smaller ones), and the attacking cavalry suffered many losses destroying Philidelphia with Newton's University and New York with Bach's Cathedral.
In 1784 AD, American commandos captured a minor Roman city due to the neglegence of Caesar's national guard, leading to the retirement of several top officials (oops!).
Rome began to catch up technologically due to the development of hospitals, discovering Refining, Scientific Method, Atomic Theory, and Electronics (the latter due to rushed TOE). America had 3 oil reserves, but these were not cut off in time to prevent the construction of more bombers. Aircraft out of the isolated city of Washington bombed the besieging Army as well as infantry guarding key supply roads causing losses to attacking American cavalry. Caesar ordered a small detachment of artillery to pound Washington, but held off on attacking the city to prevent Lincoln from trading for rubber.
When Chicago was captured along with Admiral Magellan's Naval Command Center, America was down to its last cities. Even as his nation collapsed, Lincoln continued to focus on Cumea using longbowmen with absolutely no hope of success. Seeing the opportunity for expansion, Zululand attempted to construct cities on the island as Roman and American forces were busy attacking one another, and their infantry defenders required significant assets to be diverted from finishing America. Nevertheless, Buffalo with Smith's Trading Post and the remnant of Washinton with Sistene and Copernicus were captured, and Lincoln fled to his last city of New Orleans.
Rome had prevailed against the strongest opponent in the world, but Caesar was unsatisfied that the Japanese and Zulu should remain defiant. On the same year that New Orleans fell, the invasion of Japan began.