Siege of Tarsos 55 BC
The Roman Empire, by Wolfgang Schreier, Bonn 2003
After the battle of Agosa Koilesyriakos fled to Syria, hoping to reform his troops. Caesar secured the newly won terrain, negotiating a treaty with the Bithynians in the north west of Anatolia.

Caesar in Anatolia winter 57 BC
In early spring 56 BC Caesar reached the city Ankyra which opened the gates to him without any resistance. He marched on to the Taurus Mountains during the summer where he defeated a small contingent of the still resisting Cappadocians under their general Zariadis at Lasana. After the battle the Zariadis made a truce with Caesar. The Cappadocians had to stop hostility against the Romans but where granted independence in return. Caesar now only faced minor opposition in Anatolia and was free to cross the Cilician Gates in autumn 56 BC. Entering Cicilia in the same year Caesar was halted due to a sudden onset of winter.

The Tarsos Campaign was very costly to Caesar
In early spring 55 BC Caesar then started to besiege the city of Tarsos and its master Phanias Labraundon Karikos. The siege lasted for 4 months and used nearly all the resources Caesar had. Furthermore he lost some 9.000 men during the siege, but eventually the Cicilians surrendered to the Romans. The Roman general speared the city since he needed every bit of resource. He now faced severe difficulties with supplies and men. The sea route was unstable because Cicilian pirates still terrorised the southern coast of Asia Minor and in the very summer Galatians and Cappadocians started to raid the supply routes by land despite the agreement after the battle of Lasana. To add even more problems, the city of Ankyra was protesting against Roman rule, demanding independence.
The rest of the year Caesar tried to reorganise his troops with little resources he got.

Caesar campaign in the East so far. The yellow cross symbolises the Battle of Agosa and the orange cross the much smaller Battle of Lasana. The Cappadocians were situated around the city of Mazaka.
Commentarii de Bello Asiatico by Marcus Julius Caesar
XL.
At the beginning of the new year [54 BC] Caesar got news that his protégée Calatinus the younger had failed to attack the Pirates main base at Side. What was set to be an all easy attack with 2 legions on a mostly undefended city, turned out to be a fortress guarded by the mercenary captain Lagoras Babas Lydikes who Caesar defeated at the battle of Agosa three years ago. The inexperienced Calatinus failed the attack loosing 17.000 Romans and allies alike. Caesar then began a council with his centurions of all companies discussing to march back to defeat the Cappadocians or to advance onto Syria. He reprimanded that “particularly for supposing that it belonged to them to inquire or conjecture, either in what direction they were marching, or with what object. That Zariadis Eupator [Cappadocian King] had most anxiously sought after the friendship of the Roman people after the battle at Lasana. Betraying the Romans, by madness or rage, should be rewarded by making war on them. And, by fortune or gods will Koilesyriakos would still be in Syria after the legions would be done with Zariadis.”
XLI.
Upon the delivery of this speech, the minds of all were changed in a surprising, manner, and the highest ardour and eagerness for prosecuting the war were engendered; and the sixth legion was the first to return thanks to him, through their military tribunes, for his having expressed this most favourable opinion of them; and assured him that they were quite ready to prosecute the war.
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