Army Helicopters Sighting

Yesterday afternoon, just before finishing work, when it was still fairly light outside, I witnessed a very impressive sight: two huge army helicopters flying. I don't know for sure which kind of helicopters they were, I know zilch about army equipment and vehicles, but it was those huge machines with two rotors on top, maybe Boeing Chinooks. In any case, even though I'm not a militarist I was in awe just for the cheer size of these flying things, and Wolfie even more so. I wonder where they were heading to/from. Sandhurst perhaps? We don't line that far, but we seldom see army helicopters, and I have never massive ones like them. Anyway, it made my day.