In England, as elsewhere, the growth of the towns was one of the most marked features of the twelfth century. This was due to various causes. William's conquest had opened up increased facilities for communication with the Continent: the Norman soldiers brought skilled Norman traders in their train, and so war ministered to commerce just as subsequently the Crusades were largely helpful to the growth of trade and the progress of the towns. The vigorous administration of Henry I. and Henry II. had also facilitated the expansion of industry. Henry I. favoured the rising towns both because of their commercial utility and in order to make use of their counterbalancing influence against the power of the Barons. Shrewsbury he took into his own hands, having enforced the surrender of the town from the rebellious Robert de Belesme. The amendment of the currency and the organisation of the Courts of King's Bench and Exchequer were also as favourable to material prosperity as were the legal reforms of Henry II. afterwards. The circuits of the Justices Itinerant were restored, and appeals to the king in Council were established. A further weakening of baronial power was also effected by the destruction of the castles which the lawlessness of Stephen's tenure of the sovereignty had permitted; while the introduction of scutage made the king in some measure independent of the feudal forces by enabling him to call in the support of mercenary troops. On the other hand the Assize of Arms restored the national militia to its old important place. Shrewsbury had seemed to be depressed by the conquest. The town had been granted, in the first instance, to Roger de Montgomery, whose two great works, his castle and his abbey, yet remain. Both the earl and his works were at first the cause of complaint. In Domesday Book it is pointed out that Montgomery had destroyed 51 houses to make room for his castle; to the abbey he had granted 39 burgesses; 43 houses in the town were held by Normans and exempted from taxation. Consequently, as the same sum was required from the town as had been paid _tempore regis Edwardi_, the burden fell with undue hardship on the English inhabitants who remained. But the ultimate result of both castle and monastery was beneficial to the town. The latter attracted trade and the former protected it[20], and Shrewsbury early became a commercial centre of some importance. [Sidenote: _They differed little from country, except in possession of a Merchant Gild_] The towns at this period differed but little from the country. They both engaged in agriculture as well as trade; they were alike governed by a royal officer, or by some lord's steward. In the towns the houses were of course more closely clustered, and a further difference arose afterwards in the fact that a freeman in the town, when admitted to the Gild, might be landless[21]. The chief distinction indeed between town and country lay in the fact that the former had a Merchant Gild.