The Battle of Signal Hill was a company size engagement between members of Company E, 52nd Infantry (LRP) long-range reconnaissance patrol of the 1st Cavalry Division (Airmobile) and the People's Army of Vietnam (PAVN) from 19–21 April 1968 during Operation Delaware. Signal Hill was the name given to the peak of Dong Re Lao Mountain, a densely forested 4,878-foot (1,487 m) mountain in the A Sầu Valley. The strategic location made it an ideal communication and fire support site, vital to the success of Operation Delaware.