Conquest would be the best for the type of playstyle that IE promotes and some CTF would be Interesting. Although a Siege event would be absolutely fan damn tastic.
Personally as a Smaller regiment i think that finding events is going to be hard, with the server files being private alot of events might be filled if you have no connections. although i still look forward to some fun action.
Being a small regiment (keep in mind, the term "small" is greatly changed for this type of warfare) is going to be harder all around. One good volley with these industrialized weapons in a charge, goodbye! Use those big regs as the good ol' human meat shield
It's the opposite man, why do you think the smallest combat formation was a company in 1914, while in 1918 it was a squad?
It's simpler and more succesful to move a small group of soldiers using infiltration tactics rather than relying on numbers and just move them across no-mans-land. I think it will be much easier for small regiments in IE than it is in NW, as long as they adapt, which they hopefully will unless they are commanded by a 12 year old.