[split] Log man

[-JKP-]

To me it looks like the log is broader in the middle and has 4 pegs that are inserted into the log.
...

That's interesting. That's not how I interpreted the drawing.

To me it looks like there are 2 long vertical stakes behind the "log" and the log is braced against them. They don't look to me like they are going through the log, but rather are behind them.

That's why I wondered if maybe the water current was pushing the log against the stakes rather than them being attached with spikes or something else (although they might be attached to each other on the side we can't see).

There were many river-crossing mechanisms like this in the Middle Ages. The logs and stakes weren't permanently connected to each other. Those using them for crossing used the water's current, or ropes that could be quickly untied and re-tied, to set up the next section, so they could take it with them for the next section of the river or the next river. They were used for general travel or for siege attacks.


But... it might also be stationary. Something that was put there for a specific use, rather than something temporary.