Background: Ernst Theodor Amadeus Hoffmann (commonly abbreviated as E. T. A. Hoffmann; born Ernst Theodor Wilhelm Hoffmann; 24 January 1776 - 25 June 1822) was a Prussian Romantic author of fantasy and Gothic horror, a jurist, composer, music critic, draftsman and caricaturist. His stories form the basis of Jacques Offenbach's famous opera The Tales of Hoffmann, in which Hoffmann appears (heavily fictionalized) as the hero. He is also the author of the novella The Nutcracker and the Mouse King, on which Pyotr Ilyich Tchaikovsky's ballet The Nutcracker is based. The ballet Coppelia is based on two other stories that Hoffmann wrote, while Schumann's Kreisleriana is based on Hoffmann's character Johannes Kreisler.
Context: Prussia had declared war against France on 16 March during the War of the Sixth Coalition, and their journey was fraught with difficulties. They arrived on the 25th, only to find that Seconda was in Leipzig; on the 26th, they sent a letter pleading for temporary funds. That same day Hoffmann was surprised to meet Hippel, whom he had not seen for nine years.  The situation deteriorated, and in early May Hoffmann tried in vain to find transport to Leipzig. On 8 May, the bridges were destroyed, and his family were marooned in the city. During the day, Hoffmann would roam, watching the fighting with curiosity. Finally, on 20 May, they left for Leipzig, only to be involved in an accident which killed one of the passengers in their coach and injured his wife.  They arrived on 23 May, and Hoffmann started work with Seconda's orchestra, which he found to be of the best quality. On 4 June an armistice began, which allowed the company to return to Dresden. But on 22 August, after the end of the armistice, the family was forced to relocate from their pleasant house in the suburbs into the town, and during the next few days the Battle of Dresden raged. The city was bombarded; many people were killed by bombs directly in front of him. After the main battle was over, he visited the gory battlefield. His account can be found in Vision auf dem Schlachtfeld bei Dresden. After a long period of continued disturbance, the town surrendered on 11 November, and on 9 December the company travelled to Leipzig.  On 25 February Hoffmann quarrelled with Seconda, and the next day he was given notice of twelve weeks. When asked to accompany them on their journey to Dresden in April, he refused, and they left without him. But during July his friend Hippel visited, and soon he found himself being guided back into his old career as a jurist.
Question: Why was there a battlefield?. Whats the answer?
and during the next few days the Battle of Dresden raged. The city was bombarded; many people were killed by bombs directly in front of him.