[4] In 1906, Morrow gained acclaim for leading the 21st Infantry in attacks against rebel forces on the island of Samar in the Philippines.

The citation recognized Morrow "for extraordinary heroism in action while serving as Commanding Officer, 7th Infantry Regiment, 3d Division, A.E.F., in the Claires-Chenes Woods, north of Montfaucon, France, October 20–21, 1918.

On October 20, 1918, when the Claire Chenes had been taken by the troops of his command and a hostile counterattack had forced them back over the ground gained in the morning's fighting, Colonel Morrow at once took personal command of the battalion engaged in the operations, reorganized it, and with distinguished gallantry and inspiring example led his men to a victorious counterattack, drove the enemy from the woods, secured its possession, and consolidated it.

Colonel Morrow served with conspicuous success as Commanding Officer of the 7th Infantry, 3d Division, succeeding in all of the difficult missions assigned to him.

His sound judgment and untiring energy proved important factors in the successful operations of his division against the enemy.

[9] After the war, Morrow was placed in command of the United States Disciplinary Barracks at Fort Leavenworth in Kansas.