Japanese Flag Translation Needed

[J. Smith]

Discovered this Japanese flag at an auction. I need translation of what is written on it. I can email photos on request. Thanks for any and all help.

IMG_1797

• J. Smith
• Nov 7, 2016

IMG_1796

• J. Smith
• Nov 7, 2016

 

[Shinpachi]

Looks an interesting good-luck flag which was made before the writing style was formalized with names of the soldier, his family and friends.
It says -

トーチカ 皇軍 の 威力 に 降伏 (Tochika kogun no iryoku ni kofuku)
(Enemy's) Pillbox surrendered to our imperial army's power.

A scene from a cartoon postcard during the 2nd Shino-Japanese War circa 1937.

 

[vikingBerserker]

Well done Shinpachi!

 

[Shinpachi]

Thanks !