[3]: 344 During the 1975 Spring Offensive, on 4 March the Division attacked Định Quán District, cleared Route 20 and captured Lâm Đồng Province.

[3]: 407 The 18th Division withstood the initial PAVN attacks and on 12 April were reinforced by men of the elite 1st Airborne Brigade and Vietnamese Marines.

[4]: 129–34  On the afternoon of 22 April the Division's headquarters near Xuân Lộc was hit by a CBU-55 bomb dropped from a Republic of Vietnam Air Force C-130, killing over 250 soldiers.

[4]: 140  The 4th Corps pushed on towards Biên Hòa and at 5pm on 26 April they attacked Bien Hoa Air Base and Long Bình.

[4]: 154  By the morning of April 28 troops from the 4th Corps overran ARVN positions at the eastern end of the Newport Bridge.