This is the latest in the Jack Steel series by Ian Gale. Essentially Steel is a Sharpe type character in Marlborough's army. A Captain of Grenadiers, although of course he is given detached duties, appropriate to his heroic status, in the best traditions of the genre.
This book covers the Battle of Oudenarde, the siege of Lille and the smaller actions over supply lines including Wynendael. In between he is sent on a spy mission to Paris. It all ends sadly with his wife betraying him and then getting herself killed by an evil French Major. Who of course dies at Steel's sword.
If you like Sharpe you will like this series. Well written, plenty of action, hard to put down. Recommended.