However, it has since become known that Canaris was secretly running a resistance movement, and actively discouraged Franco from joining the Axis.[1] Canaris' team did however determine that Gibraltar might be seized through an air-supported ground assault by at least two infantry regiments, three engineer battalions, and 12 artillery regiments. Canaris declared that without 380 mm (15 in) heavy assault cannon—which he knew were unavailable—Gibraltar could not be taken. When he reported to Field Marshal Wilhelm Keitel, he gave his opinion that even if Germany were able, with the co-operation of Spain, to seize Gibraltar, the British would land in Morocco and French West Africa.[1]