Alexander, sixth Laird of Merchiston, only son of the fifth Laird. He was only four years old when he inherited from his father. He also inherited from his grandfather in 1521. He married Annabella Campbell of Glenorchy (the same family as his grandfather's third wife) and they had five children: Archibald; Alexander (ancestor of the Napiers of Luton Hoo, Bedfordshire); Andrew; Margaret; and Marion. After his marriage he travelled extensively in continental Europe (with permission of the King) before being summoned home by the King in 1537. He died at the battle of Pinkie in 1547.

pumpman34added this on 25 Feb 2011according to: http://www.clannapier.org/merchnap.htm 

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1547 - Battle Of Pinkie

The Battle of Pinkie, on the banks of the River Esk on 10 September 1547, was another catastrophic waste of life encouraged by lack of discipline and weak command.

The Duke of Somerset brought his troops, cavalry and guns to the area, with naval support for his sixteen thousand men having to make their way along the beach. The Scots meanwhile, numbering around thirty-six thousand, held the best position behind the river, but lacked experience and an effective cavalry.

They were led by James Hamilton, 2nd Earl of Arran, whose lack of military ability caused him to misinterpret an English manoeuvre as their preparing to retreat. He brought his men across the river in an all-out attack, losing his advantage, and Somerset’s artillery laid in.

When Huntly regrouped his men in the chaos, Arran thought they were deserting.

Meanwhile, instead of attacking more of the enemy, many of the Highlanders were spending the crucial time robbing the bodies of the dead. The efficient army of Somerset slew fifteen thousand Scots and captured fifteen hundred, while losing only five hundred of their own.

‘Black Saturday’ was a disaster for Scotland with so many lives lost, but it was also non-productive for victorious England since it forced Queen Mary further away from Prince Edward to the Dauphin.