While I’m no expert, if I were going to add artillery units from 40 or 42 to my copy of 41, this is how I would do it.
First, use the pieces and rules from 42. Here are the stats for artillery:
Supports Infantry: When an infantry attacks along with an artillery, the infantry’s attack increases to 2. Each infantry must be matched one-for-one with a supporting artillery unit. Artillery does not support infantry on defense.
Also, note in the rules section for infantry:
Supported by Artillery: When an infantry attacks along with an artillery, the infantry’s attack increases to 2. Each infantry must be matched one-for-one with a supporting artillery unit. If your infantry outnumber your artillery, the excess infantry units still have an attack of 1. For example, if you attack with two artillery and five infantry, two of your infantry have an attack of 2 and the rest have an attack of 1. Infantry are not supported by artillery on defense.
Attack 1 (2 when supported by artillery)*
Finally, I would change the initial setup for 1941 to reflect the presence of artillery in armies already on the board. I would think that changing every 3rd infantry in a territory to artillery would be a decent start. If I did that, I would change the setup in some territories and leave the rest alone. The changed territories would reflect the following setup:
Russia: 4 infantry, 2 artillery, 1 tank, 1 fighter*
Archangel: 2 infantry, 1 artillery
Karelia: 2 infantry, 1 artillery
Caucasus: 2 infantry, 1 artillery, 1 tank
Siberia: 2 infantry, 1 artillery
Germany: 2 infantry, 1 artillery, 1 fighter, 1 bomber
Eastern Europe: 3 infantry, 1 artillery, 2 tanks
Ukraine: 2 infantry, 1 artillery, 2 tanks
West Russia: 2 infantry, 1 artillery
Japan: 3 infantry, 1 artillery, 1 tank, 1 fighter, 1 bomber
*Note that according to the FAQ put out after the game released, the territory labeled Russia should start with six infantry. If you haven’t read this FAQ, you should, as it made other changes to the setup of the board. If you swap every third infantry for an artillery, you would get four infantry and two artillery, as shown above.
The FAQ for Axis & Allies 1941 can be found here: www.wizards.com/AvalonHill/rules/AA_1941_FAQ.pdf
Also, this would mean that neither the UK nor the US would start with any artillery as their regular setup have no territories with three or more infantry. Either shrug your shoulders or change their setup as you feel appropriate, perhaps as follows:
India: 1 infantry, 1 artillery, 1 fighter
Eastern U.S.: 1 infantry, 1 artillery, 1 tank, 1 fighter, 1 bomber
The above changes should integrate artillery into a game of 1941 fairly well. The Axis would swap 5 infantry for 5 artillery and the Allies would swap 6 or 8 (with optional UK and US artillery swapping) infantry for 6 or 8 (with optional UK and US artillery swapping) artillery for the setup of the game.
My 2 IPC