However, the colonial government still felt uneasy about being undefended and a "war scare" with the French prompted further legislative revision. The Volunteer Force was reformed in 1859, and soon numbered 14 companies. The Adelaide Volunteer Artillery and the Port Adelaide Volunteer Artillery were also raised at this time. Worldwide artillery shortages due to the demands of the belligerents involved in the American Civil War meant that plans to expand the colony's artillery holdings were thwarted; as a result South Australia's armament consisted of only two 9-pounders, four 6-pounders, two 24-pound howitzers, four 12-pound howitzers and two Cohorn mortars. By the following year, the numbers of infantry had increased to 45 companies with a total of 70 officers and 2,000 men of other ranks. On 26 April 1860, the Adelaide Regiment of Volunteer Rifles was formed. In 1865 South Australia became the first state to introduce partially paid volunteers, which was a system all of the other colonies were soon to follow. This was brought about by the enacting of the "Volunteer Act (1865)" which divided all military forces into active and reserve forces. Due to organisational problems and lack of equipment, the Adelaide Regiment of Volunteer Rifles was again disbanded in early 1866, only to be reformed again in May 1866. By 16 November 1867, the Adelaide Regiment of Volunteer Rifles had been re-designated as the "Prince Alfred's Rifle Volunteers" following the Duke of Edinburgh's visit to Australia, but lack of funding saw them disbanded. A company of expatriate Scottish immigrants had formed The Scottish Company in 1865, and reformed as The Duke of Edinburgh's Own on 18 November 1867. In 1868, the colony's Whitworth 12-pounder guns, which had been purchased the year before, were fired for the first time when they were exercised at Glenelg. That year the two artillery companies were merged to form the South Australian Regiment of Volunteer Artillery.