The British Army's size may cripple its ability to support NATO or fight a major war, some experts fear. It's the smallest it's been since the 1800s.

British Army set to shrink to smallest size since before Napoleonic wars - Defence secretary says army personnel will drop below 70,000 next year - lowest since 1793 ...

Here are five lessons from the Napoleonic Wars: Never underestimate British finance. Napoleon—and Hitler—are famously known to have met with the reversal of their fortunes through invading Russia.

Back then, the British Army had around 40,000 soldiers but was rapidly increased to fight the French Revolutionary and Napoleonic wars.