Not sure what your point is. Any leader who has a country in combat will loose soldiers.

From the page you linked to:

> After consultation at Cabinet level, Prime Minister Margaret Thatcher agreed that Commander Chris Wreford-Brown should attack the Belgrano.[7]

So she listened to her top military advisers and agreed to their plan. Not sure there's anything wrong with that.

Listen to military advisors, sure. But be careful. Iraq and Afghanistan are recent, but in 100% of wars someone's advisors are wrong.

And how many for Churchill? Blame for casualties is usually chalked up for the aggressor in a war, not the defenders.

Not quite true - particularly of WW2 where is was big and long. Dresden, Hiroshima, Russian treatment of German prisoners etc. The list is very long. And where do you draw the line between aggressor and defender? Were Germany and Japan the aggressors in 1945? New Zealand helped defend the UK, as did many dominion nations. However while the threat to New Zealand was felt (from Japan), it was hardly playing the role of a defender (and declared war on Germany before the UK did). This position is common in many conflicts.

Whilst defending British civilians from invasion by Argentine aggressors.

Argentina got slapped back off those islands.