River Crossings

[Schoenwulf]

Everything in this thread makes perfect sense. However, in setting up Scenario #3 from La Campagne de Tunisie, the only river on the map (#87 from Conquest of Ethioppia) is defined as a "major river", and there are no ENG units. There are no fords identified in the instructions, but there are a couple of river hexes that depict rocks in the middle of the river......are those supposed to be fords? Otherwise, it would appear that the only crossings would be at bridges. Why then do the special rules give "river crossing numbers" for the unit types if they are not needed for bridge crossings?