Sengoku Self-Defense Force (Hideki Mori)

A Troop of Self Defence Force the leader of which was Mr. Yoshiaki Iba, suddenly time-traveled to the period of Warring States, with the large quantities of the modern age weapons.
As a matter of course, they were drawn into a vortex of the warring period as fate.
Eventually, how could they come back to the present day?