▁Rus si ans ▁and ▁ 1 5 , 0 0 0 ▁Pr us si ans . ▁Det ect ing ▁the ▁approaching ▁a val anche , ▁B enn ig sen ▁ordered ▁his ▁troops ▁to ▁retre at ▁on ▁L id z b ark ▁War mi ński ▁( He ils berg ). ▁The ▁Russian ▁army ▁took ▁up ▁strong ▁def ensive ▁positions ▁around ▁the ▁town , ▁which ▁stood ▁on ▁the ▁Ł yna ▁( Al le ) ▁River . ▁The ▁French ▁army , ▁under ▁Marsh als ▁Mur at ▁and ▁L annes , ▁attacked ▁on ▁ 1 0 ▁June . ▁B enn ig sen ▁rep elled ▁several ▁attacks , ▁resulting ▁in ▁huge ▁French ▁cas ual ties , ▁but ▁had ▁to ▁withdraw ▁towards ▁Fried land ▁the ▁following ▁day . ▁Four ▁days ▁later , ▁the ▁decis ive ▁Battle ▁of ▁Fried land ▁occurred , ▁ending ▁the ▁War ▁of ▁the ▁Four th ▁Co al ition ▁with ▁the ▁passing ▁of ▁the ▁Tre aty ▁of ▁T ils it . ▁ ▁In flu ences ▁on ▁the ▁battle ▁ ▁Geography ▁ ▁The ▁Battle ▁of ▁He ils berg ▁was ▁fought ▁on ▁the ▁Alle ▁river , ▁known ▁today ▁as ▁the ▁L yna . ▁The ▁Te ut onic ▁Castle ▁being ▁the ▁foc al ▁point ▁of ▁the ▁battle ▁was ▁held ▁by ▁Russian ▁control . ▁ ▁Ter rain ▁ ▁As ide ▁from ▁ge ographical ▁advantages , ▁the ▁Rus si ans ▁had ▁also ▁spent ▁three ▁to ▁four ▁months ▁compiling ▁tact ics ▁on ▁how ▁to ▁defend ▁against ▁a ▁French ▁invasion , ▁regardless ▁of ▁where ▁they ▁would ▁attack ▁the ▁castle ground s . ▁Def ens