In response to the financial crisis of 2007-09, the Bank of Canada intervened repeatedly to stabilize the financial system and limit the repercussions of the crisis on the Canadian economy. This article reviews the extraordinary liquidity measures taken by the Bank during this period and the principles that guided the Bank's interventions. A preliminary assessment of the term liquidity facilities provided by the Bank suggests that they were an important source of liquidity support for some financial institutions and, on a broader basis, served to reduce uncertainty among market participants about the availability of liquidity, as well as helping to promote a return to well-functioning money markets.