On the Alert : A Cavalry Picket Searching a Spruit. 1900 On the Alert : A Cavalry Picket Searching a Spruit. 1900 On the Alert : A Cavalry Picket Searching a Spruit. 1900 Print from a Painting by H.W. Koekkoek. £14.50 Quantity: at £14.50 each Add To Basket 1 in stock. 0 in your basket View Basket Checkout