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OTL the French planned a brilliant descent on England. The descent consisted of 14 ships of line, lots of transports, 12,000 soldiers, and Maurice de Saxe. The goal of the fleet was to seize the Channel for a few days and funnel the invasion force into Kent where they were opposed by 7,000 men (dispersed throughout the region). The invasion was supposed to be launched on the 25th of January, but delays pushed it back 13 days to February 8th. Then a storm came down the Channel and wrecked the British fleet, French fleet, and Dunkirk invasion force.

But what if the French had launched the invasion on the 25th of January, because they were able to get their supplies together faster, etc. 13 days isn't too much of a stretch. Andd according to experts on the War of the Austrian Succession, had the invasion been launched on time the British would have been caught off caught. And the British fleet was also further to the east in the North Sea at the time, so the French would have had more than a few days to control the Channel and deliver the invasion force.

Once ashore Maurice de Saxe and his French army would have had superiority in numbers (12,000 concentrated vs 7,000 dispersed). They also have superiority in skill and the like (this was a contingent of French veteran professional soldiers while the British army in general was highly inexperienced at the time, especially the home guard) and superiority in leadership (the French had Maurice, the British had maybe Cope). So it seems likely that the French would be able to win a victory or victories in Kent before marching towards London. At London they would still likely have superiority, but it would be lessened and would be lessening every day as the British mobilized more resources and the French are unable to be reinforced from the Continent.

The stated goal of the French invasion was to install a Jacobite monarchy, but what if in light of growing resistance from the English and finding that the supposed Jacobite support was far less than expected the French decide to abandon the Jacobite cause for a negotiated settlement. What would the French ask for in such a settlement and what would the British government be willing to accept.
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