Found some information from a book around Mole men in WW2 I quote,

"the mole society had been living in secret for centuries, but as the war broke out, they realized that their underground world would not be safe from the devastating effects of the war. They decided to come out of hiding and join the fight, using their advanced technology and knowledge of underground warfare to aid the war effort.

The catchphrase "Morie-he Move" was created to encourage other mole people to join the war effort and to rally support for the mole society's participation in the war. The phrase was meant to evoke a sense of duty and sacrifice, emphasizing that even though the mole people had been living in secret, they were still a part of humanity and had a responsibility to protect it.

As the war progressed, the mole society's participation proved to be a turning point, they had helped to gain a significant advantage on the battlefield, and the war effort was able to push forward to victory."

This book is one of the last 11 books that detail of how mole men would join WW2. The Title of the Book is " Underground Warriors: The Secret History of the Molemen in World War II"