Chief Minister Mamata Banerjee's latest victory - her Trinamool Congress has taken four of seven municipal corporations in Bengal where elections were held - is made sweeter by a win in Mirik in the hills of Darjeeling, a stronghold for years of BJP-ally the Gorkha Janmukti Morcha (GJM). "The hills are smiling," Ms Banerjee, who is in Delhi, tweeted, reserving "special thanks" for voters in Mirik for choosing the Trinamool, the first non-Gorkha party to win in the hills in 30 years. Mirik voted for a municipal body for the first time.