A couple more points.
- About naval combat elements encountering a land-stack using the RivTP (Riverine Transport Pool) to move through (not over) water regions(1), ie down the river. Only if the naval combat elements are in OP, will the movement be blocked and possible combat will ensue. Otherwise, the RivTP stack will simply sail away.
- Combat with a RivTP stack. I'm not sure what the status is currently, but I recall seeing a RivTP stack use it's Artillery to battle the naval combat elements.
- If a river region is patrolled by 4+ naval combat elements, if an enemy stack attempts to plot a move across that river region, the game will block plotting that move, although the moving stack would have a 10% chance of getting across, or the patrol could be plotted to leave the region. I'm not sure what would happen if you cannot see the patrol when you plot the move. Pocus said he'd fix this some time... when he get's around to it
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(1) When you cross a river, your stack does not actually touch the river region. They use a jump-link to cross it, which allows a stack to move from one region to a second region when the two regions do not actually physically touch each other.