In May 1902, Gobyato returned to the home city of Taganrog, where in 1903 he submitted his first work Instructions on Use of Deflection in Batteries Equipped with 3-inch Rapid-Firing Guns of 1902, written in cooperation with Colonel Demidov.

In July 1904, he was seriously wounded in the thigh in combat, and was assigned to be assistant chief of artillery of the Port Arthur fortress.

During the Siege of Port Arthur, the fighting revealed the need for a weapon to attack the Japanese in closely spaced trenches, gullies and ravines.

For services in the defense of Port Arthur was awarded five medals (among them the Order of St. George (4th degree)[1] and the Golden Sword "for courage".

After his return from captivity in May 1906, Gobyato was promoted and published an article on his first mortar ("Fighting the principles and rules of Field Artillery").