at least 10 legions participated in Severus' campaign in Judea, including Legio X Fretensis, Legio VI Ferrata, Legio III Gallica, Legio III Cyrenaica, Legio II Traiana Fortis, Legio X Gemina, cohorts of Legio V Macedonica, cohorts of Legio XI Claudia, cohorts of Legio XII Fulminata and cohorts of Legio IV Flavia Felix, along with 30–50 auxiliary units, for a total force of 60,000–120,000 Roman soldiers facing Bar Kokhba's rebels. It is plausible that Legio IX Hispana was among the legions Severus brought with him from Europe, and that its demise occurred during Severus' campaign, as its disappearance during the second century is often attributed to this war. Battle of Tel Shalem (theory) According to some views one of the crucial battles of the war took place near Tel Shalem in the Beit She'an valley, near what is now identified as the legionary camp of Legio VI Ferrata. This theory was proposed by Werner Eck in 1999, as part of his general maximalist work which did put the Bar Kokhba revolt as a very prominent event on the course of the Roman Empire's history. Next to the camp, archaeologists unearthed the remnants of a triumphal arch, which featured a dedication to Emperor Hadrian, which most likely refers to the defeat of Bar Kokhba's army. Additional finds at Tel Shalem, including a bust of Emperor Hadrian, specifically link the site to the period. The theory for a major decisive battle in Tel Shalem implies a significant extension of the area of the rebellion, with Werner Eck suggesting the war encompassed also northern Valleys together with Galilee. Judean highlands and desert Simon bar Kokhba declared Herodium as his secondary headquarters. Its commander was Yeshua ben Galgula, likely Bar Kokhba's second or third line of command. Archaeological evidence for the revolt was found all over the site, from the outside buildings to the water system under the mountain. Inside the water system, supporting walls built by the rebels were discovered, and another system of caves was found. Inside one of the caves, burned wood was found which was dated to the time of the revolt. The fortress was besieged by the Romans in late 134 and was taken by the end of the year or early in 135. Fourth phase The last phase of the revolt is characterized by Bar Kokhba's loss of territorial control, with the exception of the surroundings of the Betar