German Invasion of the British Isles. Report by the J.I.C.

9. The considerable activity by the enemy in the construction and exercising of invasion craft of new types, is considered to be directed mainly to increasing technical and tactical efficiency, and does not necessarily imply an increase in scale of attack. 10. We do not consider that our previous estimate of the covering naval force likely to be employed requires modification; except that the Germans will have more submarines available. Land Forces. 11. We previously estimated the total land forces likely to be employed at 9 armoured divisions (based on the old establishment of 400 tanks to a division) and 23 infantry divisions.