Russians walk on water?

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One way it can happen (page 51 of the user manual):

Water Hex Ferrying

Some Engineer units can also ferry units across water hexes. Engineer units with this ability have the Has Boats flag in the current scenario. The Engineer unit must not be building or dismantling a bridge and must not be laying or clearing mines. In addition, the Engineer unit must not be Disrupted or Broken, must have full Movement allowance, and must not be in Travel or Rail Mode.

The requirements for a unit to be ferried across a water hex are:

• The unit being ferried must be of Foot movement class, or be of Ski, Bicycle, or Horse movement class and consist of men (right click in Unit Picture to see this information listed) or be a unit which is On Foot (see section on Movement).

• The unit being ferried must have full Movement Allowance, must be in Travel Mode, and must not be Disrupted or Broken.

There are three limitations to this movement:
• The Water hex being moved into must be adjacent to a hex containing an Engineer unit that can perform Water Hex Ferrying.

• The Water hex being moved into must not contain a bridge.

• At most one unit at a time can enter a single Water Hex using Ferrying.

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You are not necessarily going to see the engineer unit depending upon LoS conditions.