Soon after, during the Battle of the Imjin River, Robertson was consulted by the Americans about the possible consequences of the loss of the 1st Battalion, the Gloucestershire Regiment, and he advised them not to endanger the rest of the I Corps line with a rescue attempt.
Following the Battle of the Imjin River, Robertson provided advice to the Americans regarding the consequences of the 1st Battalion, the Gloucestershire Regiment's loss, recommending against risking the safety of the rest of the I Corps line by attempting a rescue.