Following the expiration of his initial term of service, he then re-enlisted on February 1, 1864 at Warrenton, Virginia. Next assigned to the Overland Campaign led by Union General Ulysses S. Grant, Landis and his fellow 1st Pennsylvania Cavalrymen fought in the battles of Haw's Shop (May 28), Cold Harbor (May 13 to June 12) and Trevilian Station (June 11–12) before engaging in the Siege of Petersburg through March 1865, which included the battles of &lt;a href="First%20Battle%20of%20Deep%20Bottom"&gt;First Battle of Deep Bottom/Gravel Hill&lt;/a&gt; (July 27–29, 1864). It was during this phase of service that Landis transferred to the 1st Pennsylvania Battery (on September 3, 1864).