(From what I can tell, this isn't exactly true. Rather, it sounds like armored troops, mixed in with mechanized infantry.)
Troops battled guerrillas after Israel ordered its army to punch all the way to the Litani River, about 18 miles from the border.
They entered through four different points along the border and moved at least four miles inside Lebanon. Israeli officials said their soldiers were to go as far as the Litani, and hold the ground until an international peacekeeping force comes ashore.
This is one of those times when I wish that I wasn't right.
So, I guess that turns Hezbollah into "patriotic Lebanese defending their homeland", eh? (I can tell you what it turns the Israeli soldiers into.)
Presumably, there are also patriotic Lebanese who are defending their homeland who are not Hezbollah, or are only tangentally cooperating with them, in that they want to defend their country, but have no interest or training in committing terrorist acts. Of course, Hezbollah will, no doubt, gladly welcome all comers, and will milk the situation for all its worth.