Plantation towns, notably Derry, were fortified. The settlers were also required to maintain arms and attend an annual military 'muster'. There had been very few towns in Ulster before the Plantation. Most modern towns in the province can date their origins back to this period. Plantation towns generally have a single broad main street ending in a square in a design often known as a "diamond", which can be seen in communities like The Diamond, Donegal. Failures The plantation was a mixed success from the point of view of the settlers. About the time the Plantation of Ulster was planned, the Virginia Plantation at Jamestown in 1607 started. The London guilds planning to fund the Plantation of Ulster switched and backed the London Virginia Company instead. Many British Protestant settlers went to Virginia or New England in America rather than to Ulster. By the 1630s, there were 20,000 adult male British settlers in Ulster, which meant that the total settler population could have been as high as 80,000. They formed local majorities of the population in the Finn and Foyle valleys (around modern County Londonderry and east Donegal), in north Armagh and in east Tyrone. Moreover, the unofficial settlements in Antrim and Down were thriving. The settler population grew rapidly, as just under half of the planters were women. The attempted conversion of the Irish to Protestantism was generally a failure. One problem was language difference. The Protestant clerics imported were usually all monoglot English speakers, whereas the native population were usually monoglot Irish speakers. However, ministers chosen to serve in the plantation were required to take a course in the Irish language before ordination, and nearly 10% of those who took up their preferments spoke it fluently. Nevertheless, conversion was rare, despite the fact that, after 1621, Gaelic Irish natives could be officially classed as British if they converted to Protestantism. Of those Catholics who did convert to Protestantism, many made their choice for social and political reasons. The reaction of the native Irish to the plantation was generally hostile. Chichester wrote in 1610 that the native Irish in Ulster were "generally discontented, and repine greatly at their fortunes, and the small quantity of land left to them". That same year, English army officer Toby Caulfield wrote that "there is not a more discontented people in Christendom" than the Ulster Irish. Irish Gaelic writers bewailed the plantation. In an