1910's Japanese WW1 Postcards Commemorative for Bringing the Seized German Submarines U-boat / World War I / Japanese Navy Fleet dispatch to the Mediterranean and the Cape of Good Hope at British Royal Navy request

1910's Japanese WW1 Postcards Commemorative for Bringing the Seized German Submarines

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Memorial stamp saying 
"Commemorative for bringing in the seized German submarines , Taisho 8 (1919) "

To reinforce the countermeasure against German destroying sea traffic with U-boats,
Britain requested Japan to dispatch a destroyer fleet to the Mediterranean and a cruiser fleet to the Cape of Good Hope.
Although those areas were not vital to the Japan's defense, 
in order to secure rights and interests in the territories under Japanese occupation.,
the leased territory of Jiaozhou and the South Sea Islands, that had been taken from Germany,
Japan dispatched Navy forces successively.
As for Army, they fought Germany in their territory, Qingdao, in which a British regiment joined on Japan's side.
By the way, Japan also was requested to send several infantry divisions to the European front, but they rejected it.