As an introduction to I Ain’t Been Shot, Mum, the TooFatLardies offer a theatre handbook for Poland 1939 as a free-to-download pdf.
Written by Robert Avery, but based on previous works by Alexander Kawczynski and Richard Clarke, the handbook gives all the army lists you could want to play the September War, plus background information and full game statistics.
There are thirteen lists for the Poles, fifteen lists for the Germans, and five lists for the Soviets.
Each set of lists begins with the basic units of infantry: the footsloggers who will form the core of most IABSM forces. They then move onto the reconnaissance units that scouted ahead of the core forces; and then finally cover the armoured elements that back them up. Each set of lists is then followed by a section on rating the troops, and an armoury describing their game statistics.
The booklet ends with a section on using armoured trains in IABSM, and a set of Blinds for each side.
—description from the publisher