 Complete the following phrase:  Princess Amelias Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located on Williss Plateau at the northern end of the Upper Rock Nature Reserve, adjacent to Gun No. 4 of Princess Annes Battery. It was named after Princess Amelia of Great Britain, the second daughter of George II. It was formerly referred to as the 2nd Williss Battery. The plateau and its batteries had previously been named after an artillery officer by the name of Willis who was outstanding during the capture of Gibraltar in 1704. Princess Amelias Battery saw action during the 