The Princess of Wales and Prince William attended a Royal Family engagement at Mons Barracks in Aldershot.

Kate, as the Colonel of the Irish Guards, attended the event for the first time.

The Princess of Wales succeeded the Prince of Wales in the position of Colonel of the Irish Guards.

Prince William expressed his confidence in Kate as the new Colonel.

Kate gave a speech in which she expressed her pride in being the Colonel of the Irish Guards.

Kate pledged to listen to, support, and champion the Irish Guards in all they do.

The royal couple marked St Patrick's Day on Twitter before the event.

The Prince and Princess of Wales met the daughters of Warrant Officer Alistair Wigley, an Irish Guard.

The event was historic and significant for the Irish Guards.