a pitched battle meaning in English

难分难解的酣战

Each side committed its reserves and a pitched battle followed
双方都把后备部队投入了战斗，紧接着一场激战开始了。
The order fought a pitched battle with death eaters in june of 1996
凤凰社在1996年六月和食死徒进行了一场难分难解的战斗。
Conservationists fought a pitched battle with developers over the future of the site
主张保护自然环境的人同地产开发公司就该地前途进行了针锋相对的论战。
There a painting shows soldiers crossing above the barranca river in 1860 using ropes and pulleys during a pitched battle
那里挂了一幅画，内容是1860年的一场激战中，士兵用绳索和滑轮渡过巴兰卡河。