Note on this: This is for first line regular forces. For reserve, landwehr, border guard, home guard, second or third wave or other units, equipment may differ. Especially the Soviets, who were not prepared for the quick German advance and had to throw forces together to complete their part of the occupation, often differed a lot on paper strenght (presented here) and real strength on the field.
On an individual level, you are well-equipped. You most likely wear a uniform wz.36 with a wz.1937 helmet or an older French style Adrian helmet. You are equipped with a good quality Mauser bolt-action rifle (just like your German counterparts) while your Soviet counterpart wields a Mosin-Nagant bolt-action rifle. You have access to a gas mask, hand grenades, a bayonet and other personal equipment.
On a squad, platoon, battalion, regiment and division level, things differ a bit more - and the further you go, the more outmtached the Polish formation becomes.
Your rifle squad will include an LMG - the wz.28, which was a license-produced FN upgraded BAR, with quickly interchangable barrels and a pistol grip as the main upgrades. The Soviets use a similar magazine-fed weapon, the DP-28, while the Germans use a heavier belt-fed MG 34, perhaps giving them a slight advantage in sustained fire.
On the platoon level, all sides use bolt-action rifles. You and the Germans have a light mortar for support, which the Soviets lack. Here's one of your main advantages - you have an excellent AT rifle in the wz.35, which fires tungsten core bullets that are capable of taking out armoured cars, APCs and light tanks. Some of the German platoons may include an SMG for the platoon commander (although this was not standard), which both you and the Soviets lack at this time.
On the battalion level, you have 2 medium mortars, while the Soviets have 4 and the Germans 6. You have water-cooled HMGs wz.30, while the Germans have MG 34s on tripods.
In total, per battalion:
| Weapon | Poland | Germany | Soviets |
|---|---|---|---|
| LMG | 27 | 27 | 36 |
| HMG | 12 | 14 | 18 |
| Light mortar | 9 | 9 | 0 |
| Medium mortar | 2 | 6 | 4 |
| AT rifles | 9 | 0 | 0 |
| AT guns | 0 | 0 | 2 |
However, one must also take into account regimental support. Here you and your comrades make use of the excellent Bofors wz.36 37mm AT gun, while the Germans have the 37mm Pak35/36 and the Soviets the 45mm PTP-37. The Polish formation has 2 light infantry guns, while the Germans have both light and heavy infantry guns and the Soviets 6 infantry guns. However, the Polish regiment includes a recon company while the German only has a recon platoon. The Soviet infantry regiment is supposed to inlcude a light tank/armoured car company for scouting, however it is hard to determine how often that was the case in 1939.
In total, per regiment:
| Weapon | Poland | Germany | Soviets |
|---|---|---|---|
| LMG | 85 | 88 | 142 |
| HMG | 36 | 42 | 54 |
| Light mortar | 27 | 27 | 0 |
| Medium mortar | 6 | 18 | 12 |
| AT rifles | 27 | 0 | 0 |
| AT guns | 9 | 12 | 12 |
| Light infantry guns | 2 | 6 | 6 |
| Heavy infantry guns | 0 | 2 | 0 |
In addition to this, there's division support units, especially artillery. Overall, the Germans had more modern and heavier artillery than the Soviets and the Poles. The Soviets had more artillery, but were notorious in not having the signals staff, forward observers and general staff personell to use it effectively, which caused them to move all heavy artllery out of their infantry divisions and centralising them under GHQ control after the German invasion 1941.
Artillery, per division:
| Weapon | Poland | Germany | Soviets |
|---|---|---|---|
| Light field gun | 24 | 0 | 38 |
| Medium howitzer | 12 | 36 | 28 |
| Field gun | 3 | 0 | 0 |
| Heavy howitzer | 3 | 12 | 12 |
In addition to this, you have to taken into account the German superiority in the air - while the Polish air force was not destroyed on the ground (it had been moved to field bases and the initial German attack destroyed mostly school planes), it was inferior both in numbers and in quality of equipment and was groudn down during two weeks until ordered to evacuate to Romania to provide the nucleus of a new air force to be re-built with French support. The Poles thus had a hard time manouvering due to German air attacks. The Poles also lacked a formation heavy enough to stand against the German Panzer and Leichte divisions - the Polish cavalry brigades were excellent formations, but too light on tanks and AT guns and too small to counter the heavy German armoured formations. Most of the Polish armour were spread out in small armoured companies, a mix of tankettes and armoured cars, of which one was assigned to about half of the Polish infantry divisions.
The German artillery was also clearly superior during the 1939 campaign, using more modern artillery, with a larger standard calibre, longer range guns and more guns per division.