Siege of Esztergom (1241) other European states, bar Moravia, Bohemia, and the Polish duchies, which the Mongols dealt with separately. Bela's kingdom was ill-prepared for the Mongol invasion. At the time, Hungary was one of the poorest and most sparsely populated areas of Europe. The population was estimated at slightly over 2 million in the mid-thirteenth century despite its large land area, with the largest city, Esztergom, having only 12,000 inhabitants. Its armies consisted primarily of light cavalry with some light infantry, and only a handful of crossbowmen, mounted knights, and heavy infantry, in contrast to the areas further west where such troops were
Nord-Pas-de-Calais frequently used by the inhabitants. With its 330.8 people per km on just over 12,414 km, it is a densely populated region, having some 4.1 million inhabitants, 7% of France's total population, making it the fourth most populous region in the country, 83% of whom live in urban communities. Its administrative centre and largest city is Lille. The second largest city is Calais, which serves as a major continental economic/transportation hub with Dover of Great Britain away; this makes Nord-Pas-de-Calais the closest continental European connection to the Great Britain. Other major towns include Valenciennes, Lens, Douai, Béthune, Dunkirk, Maubeuge, Boulogne,