Her next line period came during the second week in July. Though it consisted of a mix of assignments similar to previous tours—working with carriers and conducting "Sea Dragon" operations—events occurred to give the duty a slightly different twist in each instance. On 25 July, while the destroyer conducted "Sea Dragon" missions along the coast, the 3d Marine Division called upon her guns to assist them in driving the Viet Cong 806th Battalion west toward waiting South Vietnamese forces. She delivered gunfire along the coast between Quang Tri and Hue and, although the Viet Cong managed to evade the marines, the combined effect of naval gunfire and 3d Division amphibious operations still resulted in a major collision between the evacuating enemy and Allied forces. The operation ended the next day, and "Theodore E. Chandler" resumed logistics interdiction duty.