tents) but more stationary castra hibera ('winter quarters', with wooden barracks). In favourable weather and with proper equipment and supplies, however, military campaigns could be extended from the 'campaigning season' into winter in an attempt to catch the enemy off-guard. For example, in the Flanders campaign, French general Jean-Charles Pichegru unexpectedly crossed the frozen Great Rivers during the harsh winter of 1794–95, and conquered the Dutch Republic. But ill-prepared winter campaigns often had disastrous consequences due to high mortality amongst the soldiers; the most notorious example of this is the French invasion of Russia by Napoleon (24 June – 14 December 1812). Therefore, army commanders sought to take into account the need to return their troops to their winter quarters, or establish new winter quarters in a secure location, well before the winter set in, so as to not leave their soldiers vulnerable to the enemy nor the elements. Evaluation The success of a military campaign is evaluated based on the degree of achievement of planned goals and objectives through combat and noncombat operations. That is determined when one of the belligerent military forces defeats the opposing military force within the constraints of the planned resource, time and cost allocations. The manner in which a force terminates its operations often influences the public perception of the campaign's success. A campaign may end in conquest, and be followed by the transition of military authority to a civil authority and the redeployment of forces, or a permanent installation of a military authority in the occupied area. Military campaigns, inside and outside defined wars, may exceed the original or even revised planning parameters of scope, time and cost. Such stalled campaigns, for example the western front in World War I, were formerly called "stalemates" but in the late 20th century the metaphor of a quagmire was often applied. Such a situation may arise of various factors such as: a small hope for victory poorly defined objectives no clear exit strategy See also General Military operations other than war – concept that encompass the use of military capabilities across the range of military operations short of war. Campaign desk – used by officers and their staffs in rear areas during a military campaign. Military strategy – collective name for planning the conduct of warfare. War cycles – the theory that wars happen in cycles. Military decorations Campaign medal – a military decoration which is