Well, didn't get as much in this update as I thought I would, but yay naval battle stuff!
Part Forty-Two: Taking the Mississippi
After Vicksburg:
With Calhoun and Arkansaw part of the Union once again, Seguín and Hancock were able to focus on the rest of the Mississippi River and gaining ground in what was considered the heart of the Confederacy. The thee prime ports on the lower Mississippi that remained in Confederate control were Memphis, Vicksburg, and New Orleans. Hancock and the Army of the Missouri focused on sieging Vicksburg first. Once Seguín and the First Texas Corps were free, Seguín joined in in the siege. Hancock had set up on the east bank of the Mississippi blocking the major rail and road routes to the east, while he First Texas Corps took up camp on the west bank of the river. Amazingly, the city lasted for almost another month after the arrival of Seguín before it fell. However, because it held out so long, the city took extensive damage from artillery during the siege and after the end of the war lost much of its economic and strategic importance.
From Vicksburg, Hancock went south along the Mississippi while Seguín want north. Seguín and the First Texas Corps marched upriver on the left bank for the next month and crossed the river once they neared Memphis. Memphis with its meager garrison was captured on September 27th. Seguín spent most of October securing the fortresses built along the east bank of the Mississippi in Tennessee and defending Memphis from raids by what was left of Bragg's army. As Hancock was moving south, the Union Gulf Squadron began a blockade off the coast of Louisiana, specifically focusing on the mouth of the Mississippi. Hancock reached Baton Rouge in early October and fought the remaining forces being led by Forrest that had not been sent north to garrison Chickasaw. Forrest's men quickly lost the battle and the remains of the Army of Mississippi ran to New Orleans to warn the city of Hancock's imminent arrival. Federal officials stopped production at the New Orleans Mint and moved all the processed gold and silver coinage into Mississippi via rail. Forrest and the Army of the Mississippi were determined to hold up Hancock as long as possible before he reached New Orleans, but he didn't foresee the move made by the Gulf Squadron on October 5th.
The Battle of Lake Pontchartrain:
By October, with the success of the Jackson Rebellion, the only major Gulf ports that had not fallen to the Union were New Orleans and Mobile, and the members of the Jackson Rebellion were soon to take the latter. Admiral David Farragut, who was in charge of the Union Gulf Squadron for the majority of the war, decided to force the squadron into Lake Pontchartrain and speed up the taking of the city after Forrest's plans became known. Farragut ordered the squadron past Smugglers' Cove and entered Lake Borgne. The two natural waterways into Lake Pontchartrain, Chef Menteur Pass and the Rigolets. Farragut opted for the Gulf Squadron to go through the Rigolets because, while better protected, the strait was also deeper on average. The squadron sailed into Lake Pontchartrain despite being bombarded by cannons at Fort Pike, and encountered Gustavus T. Beauregard and the Confederate Mississippi Squadron.
The Battle of Lake Pontchartrain began on the 5th of October. Beauregard had positioned the Mississippi Squadron in a position ideal to intercept Farragut's ships as they entered from the Rigolets and had also set a field of torpedos on the north side of the lake. Beauregard's squadron had been deeply hurt since the Confluence Campaign and in the Battle of Lake Pontchartrain contained only one ironclad, the CSS Chickasaw. Farragut, meanwhile, had three ironclads; the USS Tecumseh, the USS Manhattan, and the USS Tennessee. The USS Tecumseh led the way into the lake with the USS Brooklyn, the flagship of the squadron and the sihp that Farragut was on during the battle. As the Tecumseh entered the lake, it was forced to run close to the right edge of the lake by the Mississippi Squadron, and while turning left toward the Chickasaw, struck one of the torpedos and soon sank. At this, the Brooklyn slowed as its captain had been given orders to avoid the torpedos. The captain went to consult Farragut, who responded with his now famous utterance, "Damn the torpedos! Full speed ahead!"[1]. Miraculously, the Brooklyn did not strike any torpedos as the Tecumseh had. The Battle of Lake Pontchartrain lasted for two weeks and ended with a decisive victory for Farragut, and the capture of New Orleans with the arrival of the Army of Missouri.
[1]The incident leading to Farragut's famous quote is taken from the incident that occurred during the Battle of Mobile Bay in OTL that made Farragut say it.