From the copy:
To go along with our gun release we have just released 7 new WWI Mortar and crew codes from our 15/18mm Blue Moon Line. These packs come with a 6 man crew and sell for $8.00. More fire support for your troops.
GERMAN
15WWI-108 Heavy Minenwerfer with crew (1 mortar and 2 barrels)
15WWI-113 Light Minenwerfer with crew (1 mortar)
FRENCH
15WWI-208 Heavy Trench Mortar with crew (2 mortars)
BRITISH
15WWI-308 Light Trench Mortar with crew (2 mortars)
15WWI-309 Heavy Trench Mortar with crew (2 mortars)
AMERICAN
15WWI-406 Light Trench Mortar with crew (2 mortars)
15WWI-407 Heavy Trench Mortar with crew (2 mortars)