Calvary was rendered mostly useless on the westernfront due to barbwire, machine guns, and fast firing rifles, but it had battles where i could have made a difference.
When the campaigning season of 1915 opened, western allies expected to launch assaults that would break the the germans.
Attacks would begin with heavy artillary bombardment by field and seige guns. The infantry would go foward with bayonets and clear the trenches with calvary ready to charge through the breakthrough to dirupt the rear and reinforcments. Massed infantry columns would surge through and finish them off.
At Neuve Chapelle, this plan almost worked. The artillery smashed the front line, and the infantry got through will lightly held trenches. By the afternoon, they had advanced past the german defences into the open countryside. Runners were sent to get the cav.
However the runners took forever and the cav commanders waited even longer for confirmed orders. The germans sent in reinforcments and quickly dug new trenches before the calvary could get across the battle field. When the artillary was called to strike again, they ran out of ammunition and the attack stalled. Over the next infantry assaults, they suffered heavy casualtiesand called off the attack. If the cav had gotten the communication, it would have made a difference.
In the eastern front however barbed wire and machine guns were more thinly spread in the east allowing cav to be very effective. Cav could raid, scout and be used for reconnaissance which became impossible to do on the westernfront due to the confined battle areas… Even on the battlefield, cav could be effective when used in large numbers. Flanking was also more viable due to the wide open spaces of the front.
Heres what i propose.
Cavalry cost 4 to produce
Calvary attack on a 1 and defend on a 1 in France, Italy, and German provinces that dont border russia and austria. They provide no bonuses like on the easternfront and will be phased out it like in real life.
However on the easternfront( anywhere in Russia Austria Balkans.), Cav can upgrade the arty like planes do. Both combatent nations can get there arty upgraded in the battle. Planes will still provide their bonuses like usual with or with out cav. If cavalry numbers twice what the infantry are, they attack on a 3 and defend on a 2. This will represented that cavalry on the eastern front were dangerous at many occasions, and you needed a good amount of infantry to cover the flanks.
I dont know if cavalry were extensivily used in the middle east, india, or africa so im not sure what the rules should be there. Feel free to give advice on what else could be added.