沈光(guang)(guang)漢,早年(nian)(nian)(nian)(nian)曾入粵(yue)軍(jun)(jun)(jun)第(di)(di)(di)一(yi)師(shi)(shi)軍(jun)(jun)(jun)官補習訓(xun)練(lian)班受訓(xun)。民(min)(min)國(guo)(guo)十(shi)(shi)四年(nian)(nian)(nian)(nian)(1925)由(you)蔡(cai)廷鍇推薦,任(ren)(ren)(ren)(ren)粵(yue)軍(jun)(jun)(jun)第(di)(di)(di)一(yi)師(shi)(shi)第(di)(di)(di)一(yi)旅(lv)(lv)第(di)(di)(di)二(er)(er)(er)(er)團(tuan)(團(tuan)長(chang)(chang)蔣(jiang)光(guang)(guang)鼐)第(di)(di)(di)三營(ying)(ying)(營(ying)(ying)長(chang)(chang)黃質勝)上尉營(ying)(ying)副。民(min)(min)國(guo)(guo)十(shi)(shi)六(liu)(liu)年(nian)(nian)(nian)(nian)(1927)秋(qiu)任(ren)(ren)(ren)(ren)第(di)(di)(di)十(shi)(shi)師(shi)(shi)二(er)(er)(er)(er)十(shi)(shi)八(ba)團(tuan)代(dai)理團(tuan)長(chang)(chang)。民(min)(min)國(guo)(guo)十(shi)(shi)八(ba)年(nian)(nian)(nian)(nian)(1929)年(nian)(nian)(nian)(nian)三月,任(ren)(ren)(ren)(ren)廣(guang)東編遣區獨立第(di)(di)(di)二(er)(er)(er)(er)旅(lv)(lv)(旅(lv)(lv)長(chang)(chang)蔡(cai)廷鍇)上校副旅(lv)(lv)長(chang)(chang)兼第(di)(di)(di)一(yi)團(tuan)團(tuan)長(chang)(chang)(該團(tuan)系原(yuan)第(di)(di)(di)十(shi)(shi)師(shi)(shi)二(er)(er)(er)(er)十(shi)(shi)八(ba)團(tuan)改編)。是(shi)年(nian)(nian)(nian)(nian)秋(qiu),任(ren)(ren)(ren)(ren)第(di)(di)(di)六(liu)(liu)十(shi)(shi)師(shi)(shi)(由(you)獨二(er)(er)(er)(er)旅(lv)(lv)擴建的)一(yi)一(yi)九(jiu)旅(lv)(lv)少將(jiang)旅(lv)(lv)長(chang)(chang)。民(min)(min)國(guo)(guo)十(shi)(shi)九(jiu)年(nian)(nian)(nian)(nian)(1930)升(sheng)(sheng)十(shi)(shi)九(jiu)路軍(jun)(jun)(jun)六(liu)(liu)十(shi)(shi)師(shi)(shi)副師(shi)(shi)長(chang)(chang)(師(shi)(shi)長(chang)(chang)蔡(cai)廷鍇)。民(min)(min)國(guo)(guo)二(er)(er)(er)(er)十(shi)(shi)年(nian)(nian)(nian)(nian)(1931)獲四等寶鼎勛(xun)章(zhang)。是(shi)年(nian)(nian)(nian)(nian)六(liu)(liu)月升(sheng)(sheng)第(di)(di)(di)六(liu)(liu)十(shi)(shi)師(shi)(shi)中將(jiang)師(shi)(shi)長(chang)(chang)。民(min)(min)國(guo)(guo)二(er)(er)(er)(er)十(shi)(shi)一(yi)年(nian)(nian)(nian)(nian)(1932)十(shi)(shi)月,因“一(yi)·二(er)(er)(er)(er)八(ba)”淞(song)滬抗日有功,獲青天白日勛(xun)章(zhang)。民(min)(min)國(guo)(guo)二(er)(er)(er)(er)十(shi)(shi)二(er)(er)(er)(er)年(nian)(nian)(nian)(nian)(1933)十(shi)(shi)一(yi)月“閩(min)(min)變(bian)”爆發,任(ren)(ren)(ren)(ren)福建人民(min)(min)革命軍(jun)(jun)(jun)第(di)(di)(di)一(yi)方面(mian)軍(jun)(jun)(jun)第(di)(di)(di)一(yi)軍(jun)(jun)(jun)軍(jun)(jun)(jun)長(chang)(chang)(總司(si)令蔡(cai)廷鍇)。閩(min)(min)變(bian)失敗后回住香港(gang)。民(min)(min)國(guo)(guo)二(er)(er)(er)(er)十(shi)(shi)六(liu)(liu)年(nian)(nian)(nian)(nian)(1937)抗戰軍(jun)(jun)(jun)興,出任(ren)(ren)(ren)(ren)軍(jun)(jun)(jun)事參議(yi)員中將(jiang)參議(yi),很少在軍(jun)(jun)(jun)界活動。三十(shi)(shi)五(wu)年(nian)(nian)(nian)(nian)(1946)以后被選為第(di)(di)(di)一(yi)屆國(guo)(guo)民(min)(min)大(da)會代(dai)表(biao),也曾任(ren)(ren)(ren)(ren)私立德業小學校長(chang)(chang)。1972年(nian)(nian)(nian)(nian)11月29日病逝(shi)于香港(gang),終年(nian)(nian)(nian)(nian)八(ba)十(shi)(shi)五(wu)歲(sui)。
1930年,沈光(guang)漢將軍任十九路(lu)軍六十師(shi)副師(shi)長(chang)(chang)(師(shi)長(chang)(chang)蔡廷鍇)。
1931年,沈光(guang)漢率(lv)所部(bu)第六(liu)十師(shi)(shi)駐防蘇州、常州一帶(dai)。1931年1月28日(ri)(ri)(ri),日(ri)(ri)(ri)軍(jun)進攻(gong)(gong)上(shang)海(hai)(hai),蔡廷(ting)鍇即令沈率(lv)部(bu)開赴上(shang)海(hai)(hai)抗戰(zhan)(zhan)。1月30日(ri)(ri)(ri),沈部(bu)到達上(shang)海(hai)(hai)南翔、真茹等(deng)地(di)待命。2月1日(ri)(ri)(ri),接替(ti)駐在閘(zha)北、虹(hong)口及八(ba)字橋(qiao)等(deng)處七十八(ba)師(shi)(shi)的(de)防務。原七十八(ba)師(shi)(shi)翁(weng)照垣(yuan)旅劃歸沈光(guang)漢指揮,沈師(shi)(shi)遂成為(wei)抗戰(zhan)(zhan)主力。七十八(ba)、六(liu)十一師(shi)(shi)為(wei)總預備隊(dui)。2月3日(ri)(ri)(ri)始(shi),日(ri)(ri)(ri)軍(jun)相(xiang)繼向(xiang)吳(wu)淞(song)、閘(zha)北及江灣進犯(fan),沈光(guang)漢率(lv)所部(bu)及配(pei)屬(shu)部(bu)隊(dui)與之浴血戰(zhan)(zhan)斗30多天(tian),雖敵(di)(di)軍(jun)數倍于己,但(dan)沈師(shi)(shi)陣(zhen)地(di)始(shi)終屹(yi)立不(bu)動。尤其八(ba)字橋(qiao)陣(zhen)地(di),地(di)處要沖,敵(di)(di)軍(jun)在飛(fei)機、大炮(pao)、坦(tan)克的(de)配(pei)合(he)下,輪(lun)番(fan)攻(gong)(gong)擊,沈率(lv)部(bu)堅決抵抗,僅2月7日(ri)(ri)(ri)一天(tian),就殲日(ri)(ri)(ri)軍(jun)千余人,擊燒日(ri)(ri)(ri)軍(jun)前(qian)敵(di)(di)指揮雨田大佐。