 Although 35 of the 36 Welsh MPs voted against the bill (one abstained), Parliament passed the bill and the village of Capel Celyn was submerged, highlighting Wales' powerlessness in her own affairs in the face of the numerical superiority of English MPs in Parliament.Both the Free Wales Army and "Mudiad Amddiffyn Cymru" (Welsh Defence Movement, abbreviated as MAC) were formed as a direct result of the Tryweryn destruction, conducting campaigns from 1963.In the years leading up to the investiture of Charles as Prince of Wales in 1969, these groups were responsible for a number of bomb blasts—destroying water pipes, tax and other offices and part of the dam at the new Clywedog reservoir project in Montgomeryshire, being built to supply water to the English Midlands.