| Summary: | This essay revolves around a possible maritime strategy designed and operated by D. Afonso Henriques before and during the siege of Lisbon in 1147. In fact, we reinforce the idea of the crusading forces early involvement for the siege of that year, which has been defended by historiography. It would have existed a prior plan from the king for a military operation that he knew it would be time consuming, combining the coming of the crusading forces with the need for a territorial domination to the South, especially the geo-strategic triangle Sintra-Cascais- Lisbon to dominate the structures of surveillance, the defensive positions of the Islamic system of coastal defence and the communication paths (overland and sea) that allowed the access to the city and a safer retreat.
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