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In page Battle of Ortona:

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Some historians indicate that Ortona was of high strategic importance, as it was one of Italy's few usable deep water ports on the east coast, and was needed for docking allied ships and to shorten Eighth Army's lines of supply which at the time stretched back to Bari and Taranto. Allied forces were ordered to maintain the offensive, and going through the built-up areas in and around Ortona was the only feasible option. Ortona was part of the Winter Line defence system and the Germans had constructed a series of interlocking defensive positions in the town. This—together with the fact that the Germans had been ordered to "fight for every last house and tree"—[4][5] made the town a formidable obstacle to any attacking force.