According to historical context, Napoleon suggested striking Britain through Egypt in 1789 because he felt that was the best way to fight against the British Navy.
During this period, the British were considered to be the most powerful in terms of naval battles.
However, to have a chance against the British, Napoleon felt that it was better to take over Egypt from the Ottoman Empire to eliminate the British fleet from Mediterranean trade routes.
He believed such action or tactics would destroy the British trading supply with India and technically affect the British empire.
Hence, in this case, it is concluded that Napoleon proposed striking Britain through Egypt in 1789 to have the upper hand against them.
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