Tepetlcali campaign

The Tepetlcali Campaign, also known as the Port St. Charles Campaign, was a series of battles fought in northern New Yustona and southern Algoquona and was the initial military campaign of the Final War of the Deluge. Significant losses to heavy equipment and military organization incurred during Operation Western Blizzard prevented Algoquona from securing major strategic targets. Despite the initial unexpected success and pace of the Algoquonan advance, the Royal and Imperial Army reinforced its position in New Yustona by later December of 2020, leading to the destruction or capture of nearly the entire Algoquonan force in the western "prong" of the invasion. In the east, the smaller group of Algoquonan forces were able to retreat in good order.

Background
Four years after Operation Mission Shield and Operation Western Blizzard, Algoquona had rearmed and reorganized its military to the point where limited offensive operations were available. The reformed armed forces were now largely comprised of forces as well as allied tribal warlords. Comprised nearly entirely of infantry, Algoquonan policymakers believed that a "lightning campaign" to capture the capital city of New Yustona would be necessary in the event of war. As early as 2017, military hierarchs determined that the best strategy would be a two-pronged invasion, with a western force taking Tepetlcali and an eastern force feinting towards Mixcala before ultimately taking the city in coordination with the western force once Tepetlcali was secured. Under this plan, the forces would then quickly strike south at Port St. Charles. The plan was dependent on speed, as the lack of heavy equipment or industrial capacity meant that Algoquona would not be able to withstand the full Royal and Imperial Army, and consequently taking Port St. Charles would be a valuable negotiating asset to secure a structured settlement to maintain Algoquona's independence over the long term.

Algoquona secretly adopted this "lightning campaign" based strategy of "aggressive defense" as its new foreign policy priority in late 2017. Over the next two years, it sought a pretense to go to war while attempting to subvert Urcean elections while obtaining classified military information which would help its planned campaign. Urcean politician Ronan Cornelius Marcán began a secret correspondence which lead to the letter affair, and continued correspondence in order to undermine the Urcean monarchy. Following the revelation of this correspondence during the 2020 Urcean procuratorial election, Marcán fled to Algoquona and the Ministry of State issued an ultimatum to Algoquona for extradition. Over the course of a week, Algoquonan policymakers held closed door meetings and decided to use this ultimatum as the desired pretense for war. On 22 November 2020, Algoquonan forces crossed into New Yustona in order to execute the planned campaign.