Welcome aboard.
My preferred solutions to the French Line advantages are;
1. Terrain - especially towns. Defending towns as outposts from the main line slows the French down. Other good defensive terrain like forests and hills give parity. Given them a volley on approach, and whilst they might make the attack, the battle back could be harder on them.
2. In the open, counter advance to meet the incoming Line with your own bayonets. Might as well strike first and hardest.
3. Artillery, write them down on the approach. Forget counter battery fire or cavalry targets, wear down the French infantry.
4. Sometimes, pull back away until you reach better terrain, and have more units putting out more firepower. Especially early in the scenario, better to run and form a solid line than get taken down piecemeal.
5. Cycle units in the line, if a unit is down to 1 or 2 blocks, run away and bring in a fresh unit.
That being said.. they are monsters and battle winners, no going past that.
Glory is fleeting, but obscurity is forever.
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