沈光漢,早(zao)年(nian)(nian)(nian)(nian)曾入粵(yue)(yue)軍第(di)(di)(di)一(yi)師(shi)(shi)(shi)軍官補習訓(xun)練班受訓(xun)。民(min)(min)國(guo)十(shi)(shi)(shi)(shi)四年(nian)(nian)(nian)(nian)(1925)由蔡廷(ting)鍇(kai)推薦,任(ren)(ren)粵(yue)(yue)軍第(di)(di)(di)一(yi)師(shi)(shi)(shi)第(di)(di)(di)一(yi)旅(lv)第(di)(di)(di)二(er)(er)(er)(er)團(tuan)(團(tuan)長(chang)(chang)(chang)(chang)(chang)蔣光鼐(nai))第(di)(di)(di)三(san)營(ying)(營(ying)長(chang)(chang)(chang)(chang)(chang)黃質勝)上尉營(ying)副(fu)(fu)。民(min)(min)國(guo)十(shi)(shi)(shi)(shi)六(liu)年(nian)(nian)(nian)(nian)(1927)秋任(ren)(ren)第(di)(di)(di)十(shi)(shi)(shi)(shi)師(shi)(shi)(shi)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)八(ba)(ba)團(tuan)代理(li)團(tuan)長(chang)(chang)(chang)(chang)(chang)。民(min)(min)國(guo)十(shi)(shi)(shi)(shi)八(ba)(ba)年(nian)(nian)(nian)(nian)(1929)年(nian)(nian)(nian)(nian)三(san)月(yue)(yue),任(ren)(ren)廣東編遣區獨立(li)第(di)(di)(di)二(er)(er)(er)(er)旅(lv)(旅(lv)長(chang)(chang)(chang)(chang)(chang)蔡廷(ting)鍇(kai))上校(xiao)(xiao)副(fu)(fu)旅(lv)長(chang)(chang)(chang)(chang)(chang)兼第(di)(di)(di)一(yi)團(tuan)團(tuan)長(chang)(chang)(chang)(chang)(chang)(該團(tuan)系原第(di)(di)(di)十(shi)(shi)(shi)(shi)師(shi)(shi)(shi)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)八(ba)(ba)團(tuan)改編)。是(shi)年(nian)(nian)(nian)(nian)秋,任(ren)(ren)第(di)(di)(di)六(liu)十(shi)(shi)(shi)(shi)師(shi)(shi)(shi)(由獨二(er)(er)(er)(er)旅(lv)擴建的)一(yi)一(yi)九旅(lv)少(shao)將旅(lv)長(chang)(chang)(chang)(chang)(chang)。民(min)(min)國(guo)十(shi)(shi)(shi)(shi)九年(nian)(nian)(nian)(nian)(1930)升(sheng)十(shi)(shi)(shi)(shi)九路軍六(liu)十(shi)(shi)(shi)(shi)師(shi)(shi)(shi)副(fu)(fu)師(shi)(shi)(shi)長(chang)(chang)(chang)(chang)(chang)(師(shi)(shi)(shi)長(chang)(chang)(chang)(chang)(chang)蔡廷(ting)鍇(kai))。民(min)(min)國(guo)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)年(nian)(nian)(nian)(nian)(1931)獲四等寶鼎勛章。是(shi)年(nian)(nian)(nian)(nian)六(liu)月(yue)(yue)升(sheng)第(di)(di)(di)六(liu)十(shi)(shi)(shi)(shi)師(shi)(shi)(shi)中將師(shi)(shi)(shi)長(chang)(chang)(chang)(chang)(chang)。民(min)(min)國(guo)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)一(yi)年(nian)(nian)(nian)(nian)(1932)十(shi)(shi)(shi)(shi)月(yue)(yue),因“一(yi)·二(er)(er)(er)(er)八(ba)(ba)”淞滬抗日(ri)有(you)功(gong),獲青天白日(ri)勛章。民(min)(min)國(guo)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)二(er)(er)(er)(er)年(nian)(nian)(nian)(nian)(1933)十(shi)(shi)(shi)(shi)一(yi)月(yue)(yue)“閩變”爆(bao)發(fa),任(ren)(ren)福建人民(min)(min)革命軍第(di)(di)(di)一(yi)方面(mian)軍第(di)(di)(di)一(yi)軍軍長(chang)(chang)(chang)(chang)(chang)(總司令(ling)蔡廷(ting)鍇(kai))。閩變失敗后回住香港(gang)。民(min)(min)國(guo)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)六(liu)年(nian)(nian)(nian)(nian)(1937)抗戰軍興(xing),出任(ren)(ren)軍事參(can)議員(yuan)中將參(can)議,很少(shao)在軍界活動。三(san)十(shi)(shi)(shi)(shi)五(wu)年(nian)(nian)(nian)(nian)(1946)以后被(bei)選為第(di)(di)(di)一(yi)屆國(guo)民(min)(min)大會代表(biao),也曾任(ren)(ren)私(si)立(li)德業(ye)小學校(xiao)(xiao)長(chang)(chang)(chang)(chang)(chang)。1972年(nian)(nian)(nian)(nian)11月(yue)(yue)29日(ri)病(bing)逝于香港(gang),終(zhong)年(nian)(nian)(nian)(nian)八(ba)(ba)十(shi)(shi)(shi)(shi)五(wu)歲(sui)。
1930年,沈光(guang)漢將軍任十九(jiu)路軍六十師副師長(師長蔡廷鍇)。
1931年,沈(shen)(shen)光漢率(lv)所部(bu)(bu)第六十(shi)師(shi)(shi)駐(zhu)防蘇州、常州一(yi)帶(dai)。1931年1月(yue)28日(ri)(ri),日(ri)(ri)軍(jun)進(jin)攻(gong)上海(hai),蔡廷鍇即令沈(shen)(shen)率(lv)部(bu)(bu)開(kai)赴上海(hai)抗(kang)(kang)戰。1月(yue)30日(ri)(ri),沈(shen)(shen)部(bu)(bu)到達上海(hai)南翔、真茹等(deng)地待(dai)命(ming)。2月(yue)1日(ri)(ri),接替(ti)駐(zhu)在閘北、虹口及八(ba)(ba)字橋等(deng)處(chu)七(qi)十(shi)八(ba)(ba)師(shi)(shi)的防務(wu)。原七(qi)十(shi)八(ba)(ba)師(shi)(shi)翁照垣旅(lv)劃歸(gui)沈(shen)(shen)光漢指(zhi)揮,沈(shen)(shen)師(shi)(shi)遂(sui)成為抗(kang)(kang)戰主力。七(qi)十(shi)八(ba)(ba)、六十(shi)一(yi)師(shi)(shi)為總預(yu)備隊。2月(yue)3日(ri)(ri)始(shi),日(ri)(ri)軍(jun)相繼向吳淞、閘北及江(jiang)灣進(jin)犯,沈(shen)(shen)光漢率(lv)所部(bu)(bu)及配(pei)屬部(bu)(bu)隊與之浴血戰斗30多天(tian),雖敵(di)軍(jun)數倍于(yu)己,但沈(shen)(shen)師(shi)(shi)陣地始(shi)終屹立(li)不(bu)動。尤其八(ba)(ba)字橋陣地,地處(chu)要沖(chong),敵(di)軍(jun)在飛機、大(da)炮、坦克的配(pei)合下,輪番(fan)攻(gong)擊,沈(shen)(shen)率(lv)部(bu)(bu)堅決抵抗(kang)(kang),僅2月(yue)7日(ri)(ri)一(yi)天(tian),就殲日(ri)(ri)軍(jun)千余人,擊燒(shao)日(ri)(ri)軍(jun)前敵(di)指(zhi)揮雨田大(da)佐。