The United Kingdom once held the world’s largest empire. Whether that’s a good or a bad thing, it does suggest that the Brits have exercised a lot of military might throughout their history, in all corners of the globe. However, the UK has certainly lost its fair share of wars and battles. After all, not all of its ex-colonies were granted peaceful independence. And, Great Britain has massively overestimated itself on more than one occasion. Has the UK ever lost a war or conflict?

So, which wars and conflicts have the UK lost? Here are some of the most famous ones (as well as few lesser-known ones that deserve a mention). 

Battle of Hastings, 1066 

Let’s go all the way back to the last time the British Isles were invaded. This battle was fought between Harold, the ruling English monarch, and William, the Norman who laid claim to the British throne. As you may know, William won, decisively, changing the course of British history forever. However, it has to be said that the English nation state didn’t exist at the time, and the United Kingdom wouldn’t exist for centuries. Nevertheless, this lost conflict had a huge impact on the future of England. 

The US War of Independence, 1775-1783 

We can’t talk about British military defeats without mentioning the US War of Independence. In 1775, rebels in Boston rose up against the British due to excessive taxes. One year later, an independent American congress was formed, which declared its independence from the Brits. The British tried and failed to quell this threat, resulting in the USA being formally recognised as an independent state in 1783. The rest, as they say, is history. 

Castlebar, 1798 

It turns out that, throughout history, plenty of nations have been less than impressed with British rule. In 1798, an Irish rebellion assisted by French troops defeated a numerically superior British force at Castlebar. Unfortunately, the rebellion didn’t last long; it was all but over when the British won their war against the French. Ireland would ultimately gain its independence from the UK in 1922. 

Battle of the Somme, 1916 

In 1916, British generals decided that World War I could be won on the Western front with a ‘big push’. They were so confident that they told their troops to simply walk across no man’s land instead of dashing from cover to cover. The British lost around 20,000 soldiers on the first day of the battle. Over the next three months, both the Brits and the Germans lost around half a million men each. Certainly not a decisive victory. 

Singapore, 1942 

In 1942, around 100,000 British and Australian troops surrendered to Japan in Singapore despite having a much larger army. Japanese forces took advantage of good intel and poor command on the British side, securing an easy win in what would be remembered as one of the most humiliating defeats in British military history. 

The Suez Crisis, 1955 

In 1955, Egypt claimed control over the Suez Canal so that the nation could profit from its use. This would put an end to French and English control over international trade. Technically, the Anglo-Franco-Israeli force defeated the Egyptian army. But under pressure from the USA, a ceasefire was put in place, and Britain ultimately lost control over the canal in what many remember as a humiliating defeat.