First World War Campaigns - Cavalry Charges

[BigDuke66]

Now having done some more scenarios I'm a bit worried about what a cavalry "charge"(meaning cavalry assaulting in travel mod) is able to achieve.
I had 2 incidents were I was able to use cavalry with a great impact but felt that it should not have gone this way.
1. I assaulted a town over a stream.
2. I assaulted over an river by using a heavy bridge.

In the first case I really see a problem that no terrain except hard targets(Bunkers, Redoubts, Forts) provides any safety or at least additional protection from a cavalry charge.
I'm not sure how exactly combat was conducted on a tactical scale at this time but I can't imaging that cavalry was any good when they were mounted and assaulted a town, I wonder if that ever happened in the first World War at all.

In the second case the rules allow for the very opposite effect of what infantry as to face when attacking over a bridge.
Infantry that assaults in travel mod has it's assault value lowered to 1/4, but cavalry that assaults in travel mod does that at 4 times their assault value.
Assault values for infantry and cavalry don't differ drastically so I'm close to it when I say that I could take 4 infantry battalions(each around 1000 men) and attack over a bridge it would basically have the same power as a normal assault with 1 infantry battalion, but I could take a single cavalry regiment(672 men) doing an assault over a bridge and it would end with the power similar to a normal 2688 men assault.


Are those 2 cases really true or do I miss something?