Why did the union attempt to capture Sabine Pass?

The Union attempted to capture Sabine Pass during the Civil War because it was a strategic coastal location in Texas that served as a key entry point for Confederate supplies and troops. Control over this area would enable the Union to disrupt Confederate shipping and strengthen their blockade of Southern ports. Additionally, seizing Sabine Pass would provide the Union with a foothold for further operations in Texas and the Gulf region. The failed attempt in September 1863 highlighted the strong Confederate defenses and the challenges the Union faced in their campaign.