In an early example of a proxy war, both sides quickly received support from other countries, most notably the Soviet Union and Germany, who wanted to test their tactics and equipment.[37] The first shipment of foreign tanks, fifty Soviet T-26's, arrived on 15 October.[38] The shipment was under the surveillance of Nazi Germany's Kriegsmarine and Germany immediately responded by sending forty-one Panzer I's to Spain a few days later.[39] This first shipment was followed by four more shipments of Panzer I Ausf. B's,[40] with a total of 122 vehicles.[41]