Howe struck again. This time, Howe telephoned on 12 April 1943 to Wilson at the Royal Bank: if Howe's steel experts (likely the same experts Dunn had wrongfooted in the siderite development) were right, either Dunn must stand down from his Chairmanship of Algoma, or he would be forced to expropriate. Many precedents had accumulated over three years, both in the UK and Canada. But Wilson and his Royal Bank stood firm and refused to countenance this extreme. Wilson instead asked for disclosure of the government file, and Howe's bluff was shot. By August 1943, a vice-president at Algoma was removed and the way forward was clear. Dunn and Howe later became friends, and Howe even acquired a summer manor next door to the Dunn estate, Dayspring, at the seaside resort of St. Andrews in New Brunswick. Howe even served as an Executor of Dunn's estate. It was during the war that Dunn had two major health crises brought on by old age. These required hospital stays of 17 days and five weeks respectively. He and Christoforides, who throughout was by his side day and night, succeeded by artful means in keeping both stays from the press. Shortly after the end of the first bout with adversity, he married her. Canada Steamship Lines In 1944, Dunn was invited to serve on the board of directors of Canada Steamship Lines (CSL), whose ore carriers were an important transporter of ore and coal for the Algoma Steel plant which operated under a geographical disadvantage to its more southerly competitors. Unhappy over CSL's policy of prioritizing service to his steel mill's competition on the lower section of the Great Lakes, with backing from a Winnipeg, Manitoba businessman plus the Montreal publishing magnate, John Wilson McConnell, James Dunn quietly set about buying up shares of the shipping line. He secured a line of credit from the Bank of Montreal and through Earle McLaughlin at the Royal Bank of Canada he raised a war chest that saw him gain effective control of Canada Steamship Lines in 1951. This was followed up by the acquisition of another shipping line with cargo vessels capable of cost-effective delivery of Algoma Steel's products to the southern markets. Within a few years, Dunn was exporting iron ore from his Algoma Ore Properties Limited to American buyers. Art collection Sir James Dunn had been an avid art collector for many years.