This war is known as The Great Roman Civil War (49–45 BC) or Caesar's Civil War and began due to a series of political and military confrontations. Mainly when Ceasar started to be seen as the champion of the common people and began to push a series of reforms. This caused The Senate to begin fearing Ceasar's power and demanded that he turn over all command of his army. Upon refusing to give up his power over his army, he decided to instead march his Army to Rome and attack.
The Treaty of Versailles limited Germany's military power. The country wasn't allowed to have submarines or an air force. Its army was limited to just 100,000 men and its navy was limited to 6 ships. Germany was also not allowed to place troops in the Rhineland. In addition to these, Germany had to pay £6,600 million for the damage causes.