 Stretching between the Pfullendorf heights and the village lies a flat , wide plain , marshy in places , ringed with low @-@ lying hills , and creased with a small tributary stream from which the village takes its name . Ostrach itself lies almost at the northern end of this plain , but slightly south of the Danube itself . By 7 March , the first French forces arrived there , and the Austrians arrived a day or so later . Over the following week , additional forces for both sides arrived , and the two armies faced each other across this valley . 
