$   Blitzkrieg relied on powerful, fast strikes, piercing the enemy lines.  Tanks, although so powerful,$
$still required infantry cover.  Infantry transported on trucks was intended to keep pace with tanks and$
$support their actions in difficult conditions, especially in towns, forests and during river crossings.$
$Until September 1939 four infantry divisions were motorised. Cavalry units were motorised paralelly,$
$forming four light divisions, reorganised into armoured ones in 1940.$
$   Every armoured division comprised a motorised rifle brigade, with a motorised infantry regiment being$
$its core. $
$   On 8th September, 4th Panzerdivision riflemen supported the tanks in an attempt to take Warsaw by the$
$storm.  Soldiers supported the tanks attacking along main streets, capturing nearby buildings.  After the$
$bloody struggle German forces were forced to withdraw. Warsaw resisted until 28th of September.$
$   Experiences of campaigns in Poland and France proved that trucks aren't a safe means of transport in$
$vicinity of enemy.  In the course of war trucks were gradually replaced with armoured transporters.$
