Hybro-Cordolvan War

The Hybro-Cordolvan War, Cordolvan-Irchvanian War, Varrenian-Cordolvan War, or simply Cordolvan Imperial Wars was a conflict that began in February 258, after forces loyal to Emperador Juan Esteban San Martín invaded the Duchy of Irchvan. The Hybretians had moved a large force to the region after San Martin took power the previous year and had briefly occupied Alcores in July of 257.
The Invasion of Irchvan quickly lead to the capture of Irvine and Duke Arthur I, though the surrender was seen as invalid by the Irchvanian military, who began a guerilla campaign in Cordolvan held territory with civilian militias, while the Hybro-Irchvanian Army held the lines against the Cordolvan Advance deeper into the territory.
In the south, the Hybretian Navy launched a surprise attack on the city of Ovienares. In the subseuqent Invasion, the city surrendered and the Hybretians seized the region as a beachhead. Shortly after, a small contingent of vessels seized Alziros, and the Varrenians offloaded troops in Ovienares. King Daelin and the Second Army arrived with a number of KIAV 02mk2's. 
In response to the Hybretian invasions, San Martin took personal command of an army and began marching south.
Despite forces being pushed out of Irchvan, Hybretian losses in Ovienares were extremely high, causing a crisis in the Hybretian Government.