$  In the late thirties the modernisation of Polish Army began.  Among other things the changes included the $
$enlargement and motorization of sapper forces.  Bearing in mind the consequences of the armoured forces     $
$development in the neighbouring countries it was planned to first motorised barrage companies of army and   $
$division sapper battalions.  Furthermore it was planned to motorise and reorganize bridge squads.  At the   $
$end of the thirties the formation of motorised cavalry brigades required a creation of fully motorised and  $
$well equipped sapper squads.  Until September of 1939 the modernisation plan had not been implemented.  Only$
$two sapper battalions for motorised cavalry brigades and a part of army engineering battalions were finally $
$fully motorised.  In  several infantry divisions barrage companies were finally motorised.  The important   $
$problem of Polish sapper forces in September of 1939 was insufficient armament with explosives and materials$
$for fortification construction.                                                                             $
