アッコン包囲戦におけるリチャードの戦法について

King Richard had not yet fully recovered from his illness. He was anxious to be doing things and he was free especially to attend to the capture of the city. He saw to it therefore that the city was attacked by his men so that, perchance, by divine grace the deed might be accomplished in accord with his vow. He had a latticework shed (commonly called a “cercleia”) made. It was made solid with many joints, and when it had painstakingly been put together, he ordered it to be taken to the trench outside the city walls. When his most experienced balistarii were in position, he had himself carried out on a silken litter, so that the Saracens might be awed by his presence and also so that he could encourage his men for the fight. His balista, with which he was experienced, was then put into action and many were killed by the missiles and spears which he fired. His miners also made an underground passage to the tower at which his siege engines were firing. The miners sought out the foundations of the tower and hacked out part of it. They filled up the hole with timbers which they set afire. Then the repeated hits of the stone missiles suddenly knocked the tower to bits.
――Fordham University,”Medieval Sourcebook: Itinerarium Peregrinorum et Gesta Regis Ricardi:The Siege and Capture of Acre, 1191″より引用

こちらを訳すと以下の通り（一部意訳などを施しています）。

リチャード王は病から完全には回復していなかった。だが彼は何か行動を起こしたくてたまらず、そして都市の攻略に専念できる状況にあった。そこで彼は神の恩寵により自らの誓願が果たされることを願い、部下に都市への攻撃を命じた。彼は一般的に「セルクレア」と呼ばれる格子状の覆いが付いた小屋を作らせた。これは多くの接合部があり堅牢な造りで、入念な組立作業が終わると、彼は城壁の外にある堀へ運ばせるよう命じた。熟練のバリスタ射手たちが配置につくと、王は絹の輿に乗り外へ出た。この行動の目的は自身の姿を見せることでサラセン人を威圧すると同時に、戦闘に臨む己の部下たちを鼓舞するためであった。リチャード王自身も使い慣れたバリスタを駆使し、彼が放った石や槍などによって多くの敵を殺傷した。また、王の攻城兵器（=バリスタ）が狙いを定める塔へ通じる地下道を掘り進めた。鉱夫達は塔の基礎部分を探り当て、その一部を掘り崩した。出来た穴に木材を詰め込み、火を放った。やがて投射される石が繰り返し命中したことで、塔は突然粉々に崩れ落ちた。